var myWin;
myWin = "";
function popWinOpen(zURL,zWidth,zHeight) {
var popFeatures = "width=" + zWidth + ",height=" + zHeight + ",toolbar=0,location=0,directories=0,status=0,menuBar=0,scrollBars=1,resizable=1";
myWin = window.open(zURL,'myWin',popFeatures);
myWin.focus();
}
function popWinClose() {
// this will close the same 'myWin' popup that we opened
myWin = window.open('','myWin','');
myWin.close();
}
function pushURL(myURL) {
// this will load a new URL into the 'myWin' popup that we opened, or open a new 'myWin'
if ((!myWin.closed && myWin.location)) {
myWin.location = myURL;
} else {
var popFeatures = "width=600, height=400, toolbar=0, location=0, directories=0, status=0, menuBar=0, scrollBars=1, resizable=1";
myWin = window.open(myURL,'myWin',popFeatures); 
}
myWin.focus();
}