// shared dreamwearver scripts
function MM_swapImgRestore() { //v3.0
  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_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];}}
}

function MM_findObj(n, d) { //v4.01
  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 && d.getElementById) x=d.getElementById(n); return x;
}

function MM_swapImage() { //v3.0
  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];}
}

// script for pop-up window
var popUpWin=0;
function popUp(URLStr, width, height)
{
  if(popUpWin)
  {
    if(!popUpWin.closed) popUpWin.close();
  }
  popUpWin = open(URLStr, 'popUpWin', 'toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=no,resizable=no,copyhistory=yes,width='+width+',height='+height+'');
}

/* --- SHADE ROWS OF DATA TABLE ----- */
/* ---- DOM Scripting: Jeremy Keith----- */
window.onload = function(){
	stripeTables();		//add shade to table rows
	rotater(); 			//image rotation
	extLinks();
	setCurrent();
}

function stripeTables() {
	if (!document.getElementsByTagName) return false;
	var tables = document.getElementsByTagName("table");
	for (var i=0; i<tables.length; i++) {
		if (tables[i].className == "dataTable"){
			var shade = false;
			var rows = tables[i].getElementsByTagName("tr");
			for (var j=1; j<rows.length; j++) {	//skip header row
				if (shade == true) {
					addClass(rows[j],"rowShade");
					shade = false;
				}else{
					shade=true;
				}
			}
		}
	}
}

function addClass(element, value){
	if (!element.className)	{
		element.className = value;
	}else{
		newClassName = element.className;
		newClassName += " ";
		newClassName += value;
		element.className = newClassName;
	}
}
/* ------ END SHADE ROWS OF DATA TABLE ---- */



/*------- IMAGE ROTATION JAVASCRIPT --------*/

//Rotate main image on page load
function rotater() {
	if (!document.getElementById) return false;
	var myImage = document.getElementById("homeImage");
	if (!myImage) return false;	//see if ref image exists
	var poolCt = 29; // Set this var to the number of items in image pool
	var imageId = Math.floor((Math.random() * poolCt+1));
	myImage.setAttribute("src", "/images/home/" + "home_image" + imageId + ".jpg" );
}
/*---------- End Rotation Javascript ----------*/ 


/*-- Add ADA content to external links --*/
function extLinks() {
	if (!document.getElementsByTagName) return false;
	var links = document.getElementsByTagName("a");
	for (var i=0; i<links.length; i++) {
		if (links[i].className == "external"){
			var adaTag = document.createElement("span");
			var textTag = document.createElement("em");
			var adaText = document.createTextNode(" - external link"); //add supplimental ADA text

			textTag.appendChild(adaText);
			adaTag.appendChild(textTag);
			links[i].appendChild(adaTag);
			
			links[i].setAttribute("title","Link to External Site"); //add title attribute
		}
	}
}


/*-- TRACK CURRENT ITEM ON MENU --*/
/* reference: DOM Scripting by Jeremy Keith
/* apply a current style to the the menu items based on a comparison
of the link url and the window url*/
function setCurrent() {
	if (!document.getElementsByTagName) return false;
	if (!document.getElementById) return false;
	if (!document.getElementById("sideColumn1"))return false;
	var nav = document.getElementById("sideColumn1");
	var links = nav.getElementsByTagName("a");

	for (var i=0; i<links.length; i++){
		var linkurl = links[i].getAttribute("href"); 
		var currenturl = window.location.href;
		if (currenturl.indexOf(linkurl) != -1){ /*compare the window and link urls*/
			links[i].className = "here";
		}
	}
	/* if the root url has no reference to the index.html, 
	go a head and set the home page as the current page*/
	root_key = currenturl.length -5;
	if (currenturl.lastIndexOf(".edu/") == root_key){
		links[0].className = "here";
	}
}