function externalLinks() { 
 if (!document.getElementsByTagName) return; 
 var anchors = document.getElementsByTagName("a"); 
 for (var i=0; i<anchors.length; i++) { 
   var anchor = anchors[i]; 
   if (anchor.getAttribute("href") && 
       anchor.getAttribute("rel") == "external") 
     anchor.target = "_blank"; 
 } 
} 
window.onload = externalLinks;


function swapimg(imgno) {
	var imgtxt_new = "pic_"+imgno;
	var imgtxt_current = "pic_"+current_image;
	if(imgtxt_new!=imgtxt_current) {
		document.getElementById(imgtxt_current).style.display = "none";
		document.getElementById(imgtxt_new).style.display = "block";
		current_image = imgno;
	}
}