function displayRolloverMenu(nav)
{
	navElement = document.getElementById(nav + 'Navigation');
	navImgElement = document.getElementById(nav);
	rolloverElement = document.getElementById(nav + 'Rollover');
	
	for(var i = 0; i < rolloverIDArray.length; i++)
	{
		var rol = document.getElementById(rolloverIDArray[i] + "Rollover");
		rol.style.display = 'none';
	}
	
	//Calculate the top and left position for the rollover menu
	
	//ie 7 calculates the offsets differently than modern browsers
	var ie7 = (document.all && !window.opera && window.XMLHttpRequest) ? true : false;
	var ie7Left = ie7Top = 0;
	
	//variables used for calculation
	var Left = Top = 0;

	//loop through and get positions of parents
	var obj = navElement; 
    if (obj.offsetParent) 
    {
    	do 
        {
			Left += obj.offsetLeft;
			Top += obj.offsetTop;
		} while (obj = obj.offsetParent);
		
		/*special offset for ie7*/
		if (jQuery.browser.msie)
		{
			var ieVer = parseInt(jQuery.browser.version);
			if (7 == ieVer)
			{
				ie7Top = 3;
			}
		}
		
		//final calculation of the left and top
		Left = Left + ie7Left;
		Top = Top + ie7Top - 3;
		//alert("Left: " + Left + ", Top: " + Top);
	}
	
	
	
	
	
	
	if (rolloverElement != undefined)
	{
		navImgElement.src = 'images/bt_' + nav + '_On.gif';
		rolloverElement.style.left = Left + "px";
		rolloverElement.style.top = Top + "px";
		rolloverElement.style.width = navElement.offsetWidth + "px";
		rolloverElement.style.display = 'block';
	}
	
	
	
	
	
}