var popup;
var height=450;
var width=400;
var left=(screen.width/2)-(400/2);
var top=(screen.height/2)-(450/2);
function linkpop(filename){
popup = window.open(filename, "","height="+height+",width="+width+",top="+top+",left="+left+",location=no,menubar=no,resizable=yes,scrollbars=no,status=no,titlebar=no,toolbar=no,directories=no");
}