var displayWidth = screen.availWidth;
var displayHeight = screen.availHeight;

function openWin(theURL,winName,winWidth,winHeight,winScroll,winMenubar) {
	var openWidth = winWidth;
	var openHeight = winHeight;
	var openScroll = winScroll;
	var openMenubar = winMenubar;
	var WinX = (displayWidth-openWidth)/2;
	var WinY = (displayHeight-openHeight)/2-20;
	var optionWin = "directories=no,titlebar=no,toolbar=no,location=no,status=no,resizable=no,";
	optionWin +=  "left=" + WinX + ",top=" + WinY + ",width=" + openWidth + ",height=" + openHeight + "," + openScroll + "," + openMenubar;
	window.open(theURL,winName,optionWin);
}