function popUp(u, n, w, h, l, t, rs, s) {
  var URL = u;
  var Name = n;
  var winparams = "location=0,menubars=0,toolbars=0,width=" + w + ",height=" + h + ",left=" + l + ",top=" + t + ",resizable=" + rs + ",scrollbars=" + s;
  pop = window.open(URL,Name,winparams);
}
function showPortImg(n) {
	popUp("portfolio_item.php?n="+n, "portImg"+n, 400, 400, n*10, n*10);
}