function popup_init()
{
  if (!document.getElementsByTagName) {return false;}
  var anchors = document.getElementsByTagName('a');
  for(i=0; i<anchors.length; i++)
          if (anchors[i].className == 'popup')
                  anchors[i].onclick = popup;
  return true;
}
function popup()
{
	var size = this.getAttribute('rel');
	var url = this.getAttribute('href');
	if (/png|gif|jpg|jpe|jpeg/.exec(this.href)) 
		var img = true;

	var scrollbars = 0;

  /* computes dimensions passed from "rel" tag; format: <width>x<height>, output: width=<width>,height=<height> */
	if (size) {
		size = size.split('x');
		if (img) {
			if (size[0] > screen.width) {
				size[0] = screen.width;
				scrollbars = 1;
			}
			if (size[1] > screen.height - 150) {
				size[1] = screen.height - 150;
				size[0] = parseInt(size[0]) + 16;
				scrollbars = 1;
			}
			if (size[0] == 1000 && scrollbars == 1){
				size[0] = 1016;
			}

			popup_size = 'width='+size[0]+',height='+size[1];
		}
		else {
			popup_size = 'width='+size[0]+',height='+size[1];
      if (size[1] == 500) scrollbars = 1;
		}
	}
	else {
		var popup_size = 'width=640,height=480,scrollbars=1';
	}

	/* window options */
	var win_options = 'left=20,top=20,dependent=1,resizable=1,scrollbars='+scrollbars+',location=0,menubar=0,statusbar=0,'+popup_size;

	/* creates new window */
  if (win = window.open(this.href,'_blank',win_options)) {
		if (img) {
			var imgs = this.getElementsByTagName('img');
			if (imgs[0]) {
				var title = imgs[0].getAttribute('title');
				var alt = imgs[0].getAttribute('alt');
			}
			else {
				var title = this.getAttribute('title');
				var alt = title;
			}
			win.document.open();
			win.document.write('<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">');
			win.document.write('<html xmlns="http://www.w3.org/1999/xhtml">');
			win.document.write('<head><title>'+title+'</title>');
			win.document.write('<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />');
			win.document.write('<style type="text/css">body{margin:0; padding:0;} img{display:block}</style>');
			win.document.write('</head><body>');
			win.document.write('<img src="'+this.href+'" alt="'+alt+'" title="'+title+'" onclick="window.close()" />');
			win.document.write('</body></html>');
			win.document.close();
		}
		return false;
  }
	
  /* follows link on failure */
	return true; 
}
