window.onload = function() {
						   // check to see that the browser supports the getElementsByTagName method
						   // if not, exit the loop
						   if (!document.getElementsByTagName) {
							  return false;
						   }
						   // create an array of objects of each link in the document
						   var popuplinks = document.getElementsByTagName("a");
						   // loop through each of these links (anchor tags)    
						   for (var i=0; i < popuplinks.length; i++) {   
							  // if the link has a class of "popup"...   
							  if (popuplinks[i].getAttribute("class") == "popup") {   
								 // add an onclick event on the fly to pass the href attribute   
								 // of the link to our second function, openPopUp    
								 popuplinks[i].onclick = function() {   
								 openPopUp(this.getAttribute("href"));   
								 return false;    
								 }    
							  }
						   }
						}
						
						function openPopUp(linkURL) {
						   window.open(linkURL,'popup','width=1500,height=1000')
						}