//Includes functions for Navigation bar and Buttons

function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}

dropDownBottomX = 0;
dropDownBottomY = 0;

var CurrentNavHighlight;

function GetPassHeight(lessHeight,minHeight) 
{
	if (document.layers) { 
		returnHeight = window.innerHeight - lessHeight;
		if (returnHeight <= minHeight) {
			returnHeight = minHeight
		}
		return returnHeight;
	}
	else if (document.all) { 
		returnHeight = document.body.clientHeight - lessHeight;
		if (returnHeight <= minHeight) {
			returnHeight = minHeight
		}
		return returnHeight;
		
	}
	else return(300);
}

function GetPassWidth(lessWidth,minWidth) 
{
	if (document.layers) { 
		returnHeight = window.innerWidth - lessWidth;
		if (returnWidth <= minWidth) {
			returnWidth = minWidth
		}
		return returnWidth;
	}
	else if (document.all) { 
		returnWidth = document.body.clientWidth - lessWidth;
		if (returnWidth <= minWidth) {
			returnWidth = minWidth
		}
		return returnWidth;
		
	}
	else return(300);
}

function NavBar(TurnOnNavHighlight) { //Call these functions from onload in the body of pages with a nav bar
	CurrentNavHighlight = TurnOnNavHighlight
	NavSetup(); //Highlight appropriate nav button
}

var UnavailButtons = "UnavailableButtons";

function HighlightButton(sButtonName) {
	if (sButtonName != 'X' && Finder(UnavailButtons,sButtonName) <= 1) {
		document.getElementById(sButtonName + 'ButtonText').className='buttonfonth';
		MM_swapImage(sButtonName + 'ButtonLeft','','images/buttons/button_h_part_left.gif',sButtonName + 'ButtonRight','','images/buttons/button_h_part_right.gif',1);
		MM_swapImage(sButtonName + 'ButtonClusterLeft','','images/buttons/button_h_cluster_part_left.gif',sButtonName + 'ButtonClusterRight','','images/buttons/button_h_cluster_part_right.gif',1);
		document.getElementById(sButtonName + 'ButtonMid').className='midhighlight';
	}
}

function UnHighlightButton(sButtonName) {
	if (sButtonName != 'X' && Finder(UnavailButtons,sButtonName) <= 1) {
		document.getElementById(sButtonName + 'ButtonText').className='buttonfont';
		MM_swapImage(sButtonName + 'ButtonLeft','','images/buttons/button_part_left.gif',sButtonName + 'ButtonRight','','images/buttons/button_part_right.gif',1); 
		MM_swapImage(sButtonName + 'ButtonClusterLeft','','images/buttons/button_cluster_part_left.gif',sButtonName + 'ButtonClusterRight','','images/buttons/button_cluster_part_right.gif',1); 
		document.getElementById(sButtonName + 'ButtonMid').className='midstandard';
	}
}

function UnavailButton(sButtonName) {
	UnavailButtons = UnavailButtons +','+ sButtonName
	if (sButtonName != 'X') {
		document.getElementById(sButtonName + 'ButtonText').className='buttonfontu';
		MM_swapImage(sButtonName + 'ButtonLeft','','images/buttons/button_u_part_left.gif',sButtonName + 'ButtonRight','','images/buttons/button_u_part_right.gif',1);
		MM_swapImage(sButtonName + 'ButtonClusterLeft','','images/buttons/button_u_cluster_part_left.gif',sButtonName + 'ButtonClusterRight','','images/buttons/button_u_cluster_part_right.gif',1);
		document.getElementById(sButtonName + 'ButtonMid').className='midunavail';
	}
}

function AvailButton(sButtonName) {
	UnavailButtons = Remover(UnavailButtons,sButtonName);;
	UnHighlightButton(sButtonName)
}

function Finder(item,SearchChar) {
	var _item=item.split(","+SearchChar);
  return(_item.length);
}

function Remover(item,SearchChar) {
	var _ret="";
	var _item=item.split(","+SearchChar);
	for(var i=0;i<_item.length;i++) {
		_item[i]+="";
		_ret+=_item[i];
	}
  return(_ret);
}

function HighlightNav(sButtonName) {
	if (sButtonName != 'X') {
		document.getElementById(sButtonName + 'ButtonText').className='navfonth';
		document.getElementById(sButtonName + 'ButtonMid').className='midnavhighlight';
	}
}

function UnHighlightNav(sButtonName,UnHighlightNavAll,NavBarColor) {
	if (CurrentNavHighlight != sButtonName) {
		if (document.layers) {
			UnHighlightNav2(sButtonName,NavBarColor)
		}
		if (document.getElementById&&!document.all) {
			UnHighlightNav2(sButtonName,NavBarColor)
		}
		else {
			if (UnHighlightNavAll == "Yes") {
				UnHighlightNav2(sButtonName,NavBarColor)
			}
			if ((document.all.HelpLayer.style.visibility != "visible")/*&&(document.all.DataLayer.style.visibility != "visible")*/) {
				UnHighlightNav2(sButtonName,NavBarColor)
			}
		}
	}
	//else {
	//	UnHighlightNav2(sButtonName)
	//}
}

function UnHighlightNav2(sButtonName,NavBarColor) {
	document.getElementById(sButtonName + 'ButtonText').className='navfont';
	document.getElementById(sButtonName + 'ButtonMid').className='midnav'+NavBarColor;
}

function NavSetup() { //Check navform on each page to highlight button of current section of site
	if (CurrentNavHighlight == "Home") {HighlightNav('Home'); return; }
	if (CurrentNavHighlight == "GeoSelection") {HighlightNav('GeoSelection'); return; }
	if (CurrentNavHighlight == "GeoAnalysis") {HighlightNav('GeoAnalysis'); return; }
	if (CurrentNavHighlight == "SiteHelp") {HighlightNav('SiteHelp'); return; }
	if (CurrentNavHighlight == "UserPoints") {HighlightNav('UserPoints'); return; }
	if (CurrentNavHighlight == "Subscribe") {HighlightNav('Subscribe'); return; }
}


function MoveLayers(activeLayerName) {
	if(parseInt(navigator.appVersion) < 4) return;
	if(document.layers) {
		document.layers.HelpLayer.left = GetAbsLeft(document.getElementById('SiteHelpButtonLeft'));
		document.layers.HelpLayer.top = GetAbsTop(document.getElementById('SiteHelpButtonLeft'))+16;
		//document.layers.DataLayer.left = GetAbsLeft(document.getElementById('DataInfoButtonLeft'));
		//document.layers.DataLayer.top = GetAbsTop(document.getElementById('DataInfoButtonLeft'))+16;
	}
	else {
		document.all.HelpLayer.style.pixelLeft = GetAbsLeft(document.getElementById('SiteHelpButtonLeft'));
		document.all.HelpLayer.style.pixelTop = GetAbsTop(document.getElementById('SiteHelpButtonLeft'))+16;
		//document.all.DataLayer.style.pixelLeft = GetAbsLeft(document.getElementById('DataInfoButtonLeft'));
		//document.all.DataLayer.style.pixelTop = GetAbsTop(document.getElementById('DataInfoButtonLeft'))+16;
	}
	dropDownBottomX = GetAbsLeft(document.getElementById(activeLayerName+'Bottom'));
	dropDownBottomY = GetAbsTop(document.getElementById(activeLayerName+'Bottom'));
}


function HideDropdowns() { //Hide dropdowns layers
	MM_showHideLayers(/*'DataLayer','','hide',*/'HelpLayer','','hide'/*,'GeoSelectionLayer','','hide'*/);

}


function MM_findObj(n, d) { //v4.0
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && document.getElementById) x=document.getElementById(n); return x;
}

function MM_showHideLayers() { //v3.0
  var i,p,v,obj,args=MM_showHideLayers.arguments;
  for (i=0; i<(args.length-2); i+=3) if ((obj=MM_findObj(args[i]))!=null) { v=args[i+2];
    if (obj.style) { obj=obj.style; v=(v=='show')?'visible':(v='hide')?'hidden':v; }
    obj.visibility=v; }
}

function MM_swapImgRestore() { //v3.0  //DreamWeaver canned code
  var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}

function MM_swapImage() { //v3.0  //DreamWeaver canned code
  var i,j=0,x,a=MM_swapImage.arguments; document.MM_sr=new Array; for(i=0;i<(a.length-2);i+=3)
   if ((x=MM_findObj(a[i]))!=null){document.MM_sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
}

function ShowHideLayers(layername,vis) {
 
}

function GetAbsTop(oElement)
{

	var nRet = oElement.offsetTop;

	if (oElement.offsetParent)
	{
		while (oElement.offsetParent != null)
		{
			oElement = oElement.offsetParent;
			nRet += oElement.offsetTop;

		}
	}
	return nRet;
}

function GetAbsLeft(oElement)
{
	var nRet = oElement.offsetLeft;
	if (oElement.parentElement)
	{
		while (oElement.parentElement != null)
		{
			oElement = oElement.parentElement;
			nRet += oElement.offsetLeft;
		}
	}
	return nRet;
}

function checkEdge() {
	if ( typeof( document.all.HelpLayer ) == 'object') {
	if ((document.all.HelpLayer.style.visibility == "visible")/*||(document.all.DataLayer.style.visibility == "visible")*/) {
		var mouseX = window.event.clientX;
		var mouseY = window.event.clientY;
		if (mouseY < (45 - document.body.scrollTop)) {
			HideDropdowns();
			UnHighlightNav('SiteHelp','Yes');
			//UnHighlightNav('DataInfo','Yes');
		}
		if (mouseY > dropDownBottomY + (5 - document.body.scrollTop)) {
			HideDropdowns();
			UnHighlightNav('SiteHelp','Yes');
			//UnHighlightNav('DataInfo','Yes');
		}
		if (mouseX < dropDownBottomX-2) {
			HideDropdowns();
			UnHighlightNav('SiteHelp','Yes');
			//UnHighlightNav('DataInfo','Yes');
		}
		if (mouseX > dropDownBottomX+161) {
			HideDropdowns();
			UnHighlightNav('SiteHelp','Yes');
			//UnHighlightNav('DataInfo','Yes');
		}
	}
	}
}


document.body.onclick=HideDropdowns;
document.body.onscroll=HideDropdowns;
document.body.onmousemove=checkEdge;