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";
 	}
}

function showtshirt() { 
	var OpenWindow=window.open("", "newwin","height=452,width=500"); 
	OpenWindow.document.write("<img src='images/tshirt.jpg'>");
	OpenWindow.document.write("<br>") ;
	OpenWindow.document.write("<center><a href='javascript:self.close()' target='_self'>Close</a></center>") ;
} 

window.onload = externalLinks;