function popup(mylink, windowname,width1,height1)
{
    //window.alert(width1);
	if (! window.focus)
        return true;
    var href;
    if (typeof(mylink) == 'string')
        href=mylink;
    else
        href=mylink.href;
      
    myImage = new Image();
    myImage.src = href;
    //window.alert(href);
    var height='300px';
    if (myImage.height > '50px')
    	height=myImage.height;
    var width='400px';
    if (myImage.width > '50px')
    	width=myImage.width;
    window.open(href, windowname, 'height='+(height1+50)+',width='+(width1+50)+',menubar=no,scrollbars=yes,resizable=yes');
    return false;
}