// global vars

var popupWin;
var scrnwidth=screen.width;
var scrnheight=screen.height;





// "only 1 open at a time" popup function.
//-----------------------------------------------------------------------------
// The fifth argument, windowname, is optional.  If specified, it is passed as
// the second argument to window.open().  This is required in order to leave
// the popup opener page (without closing the popup), come back to it, and NOT
// have a duplicate popup window.
//-----------------------------------------------------------------------------

function openPop (url, width, height, addloptions, windowname) {
	if (windowname == null) {
		windowname = "";
	}
	var xspot = Math.round((scrnwidth/2)-(width/2));
	var yspot = Math.round((scrnheight/2)-(height/2)-30);
	features = "height="+height+",width="+width+",top="+yspot+",screenY="+yspot+",left="+xspot+",screenX="+xspot;
	if (addloptions && addloptions!="") { features += ","+addloptions; }
	if (!popupWin || popupWin.closed) {
		popupWin = window.open(url, windowname, features);
	}
	else {
		window.popupWin.close();
		popupWin = window.open(url, windowname, features);
	}
}



// Function to open video gallery 
function openVideoGalleryPopup(url) {
	openPop(url, 780, 620, 'scrollbars,resizable');
}