function openlargeimg(img_name,imgsrc)
{
var newImg = new Image();
newImg.src = imgsrc;
w = newImg.width;
h = newImg.height;
if (w == 0 && h==0)
{
var newImg1 = new Image();
newImg1.src = imgsrc;
w = newImg1.width;
h = newImg1.height;
}
var newwin;
l = (screen.availWidth-10 - w) / 2;
t = (screen.availHeight-20 - h) / 2;
features = "width="+w+",height="+h+",left="+l+",top="+t;
features += ",screenX="+l+",screenY="+t;
features += ",scrollbars=0,resizable=1,location=0";
features += ",menubar=0,toolbar=0,status=0";
newwin=window.open("", "", features);
newwin.document.write(""+img_name+"");
newwin.document.write("");
newwin.document.write("