function chgMainPhoto(newPhoto){
	//change the picture
	var imgObj = getObjectByID('ctl00_ContentPlaceHolder1_imgLarge');
	imgObj.src = "ProductImages/" + "L_" + newPhoto;
	
	var lnkObj = getObjectByID('ctl00_ContentPlaceHolder1_lnkLightBox');
	lnkObj.href = "ProductImages/" + newPhoto;
};

function getObjectByID(id) {
   if (document.getElementById) { // DOM-compliant browsers (MSIE5, NSN6, O5)
       return document.getElementById(id);
   } else if (document.all) { // MSIE4
       return document.all[id];
   } else if (document.layers) { // NSN4
       return document.layers[id];
   } else { // Trap DHTML-impaired browsers 
       //alert("Your browser does not support DHTML!");
       return false;
   }
};