var winX = screen.availWidth;
var winY = screen.availHeight;
var winWidth;
var winHeight;
var winName;
var options = "scrollbars=auto,resizable=yes,menubar=no";


//this function is for windows -- open in middle of screen
function openWin(winUrl,winName,winWidth,winHeight) {

                   window.open(winUrl, winName, "width=" + winWidth + ", height=" + winHeight +",left="+(winX-winWidth)/2+",top="+(winY-winHeight)/2 + options);

         }