var preloadFlag = false;

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 preloadImages() 
{
	if (document.images) 
	{
		tab_leads_over = newImage("images/tab_leads-over.gif");
		tab_tools_over = newImage("images/tab_tools-over.gif");
		tab_account_over = newImage("images/tab_account-over.gif");
		preloadFlag = true;
	}
}