function newImage(arg) 
{
	if (document.images) 
	{
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}

function changeImages() 
{
	if (document.images && (preloadFlag == true)) 
	{
		for (var i=0; i<changeImages.arguments.length; i+=2) 
		{
			document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
		}
	}
}

function selectThisMenu(myID)
{
	var thisOne=document.getElementById(myID)
	if(thisOne.className=="leftMenuItemSelected"){return;}
	else
	{
		var leftMenu=document.getElementById('leftMenu');
		var menus=leftMenu.getElementsByTagName('a');
		var len=menus.length;
		
		for(var i=0; i<len; i++) 
		{ 
			if(menus[i].id==myID)
			{
				menus[i].className="leftMenuItemSelected";
			}
			else
			{
				menus[i].className="leftMenuItem";
			}
	    }		
	}
}
	
function changeMenuStyles(myID, over) 
{
	var thisOne=document.getElementById(myID);
	if(thisOne.className=="leftMenuItemSelected"){return;}
	else
	{
		var leftMenu=document.getElementById('leftMenu');
		var menus=leftMenu.getElementsByTagName('a');
		var len=menus.length;
		
		for(var i=0; i<len; i++) 
		{ 
			if(menus[i].id==myID)
			{
				if(over){menus[i].className="leftMenuItemHover";}
				else{menus[i].className="leftMenuItem";}
			}
			else if(over && menus[i].className=="leftMenuItemSelected")
			{
				menus[i].className="leftMenuItemSelectedHoverOther";
			}
			else if(menus[i].className=="leftMenuItemSelectedHoverOther")
			{
				menus[i].className="leftMenuItemSelected";
			}
	    }		
	}
}

var preloadFlag = false;
function preloadImages() {
	if (document.images) {
		Home_over = newImage("http://www.nottingham.ac.uk/business/CorporateImages/TopMenu/Home-over.jpg");
		About_over = newImage("http://www.nottingham.ac.uk/business/CorporateImages/TopMenu/About-over.jpg");
		Undergraduate_over = newImage("http://www.nottingham.ac.uk/business/CorporateImages/TopMenu/Undergraduate-over.jpg");
		MA_over = newImage("http://www.nottingham.ac.uk/business/CorporateImages/TopMenu/MA-over.jpg");
		MBA_over = newImage("http://www.nottingham.ac.uk/business/CorporateImages/TopMenu/MBA-over.jpg");
		PhD_over = newImage("http://www.nottingham.ac.uk/business/CorporateImages/TopMenu/PhD-over.jpg");
		Exec_over = newImage("http://www.nottingham.ac.uk/business/CorporateImages/TopMenu/Exec-over.jpg");
		Alumni_over = newImage("http://www.nottingham.ac.uk/business/CorporateImages/TopMenu/Alumni-over.jpg");
		Research_over = newImage("http://www.nottingham.ac.uk/business/CorporateImages/TopMenu/Research-over.jpg");
		Staff_over = newImage("http://www.nottingham.ac.uk/business/CorporateImages/TopMenu/Staff-over.jpg");
		News_over = newImage("http://www.nottingham.ac.uk/business/CorporateImages/TopMenu/News-over.jpg");
		Sitemap_over = newImage("http://www.nottingham.ac.uk/business/CorporateImages/TopMenu/Sitemap-over.jpg");
		Contact_over = newImage("http://www.nottingham.ac.uk/business/CorporateImages/TopMenu/Contact-over.jpg");
		preloadFlag = true;
	}
}