function launchWS(winName) {

//window height and width
myHeight = screen.height*.80;
myWidth = 740;
//widow height bounds
if ( myHeight < 500 ) {
myHeight = 500;
} else if (myHeight>550) {
myHeight = 550;
}
//get screen size, and cacl center screen positioning
var height = screen.height;
var width = screen.width;
var leftpos = width / 2 - myWidth / 2;
var toppos = (height / 2 - myHeight / 2) - 40; 

   //open window
   msgWindow=window.open(winName,"ws_window","toolbar=no,location=no,directories=no,resizable=yes,menubar=no,scrollbars=no,status=yes,width=" + myWidth + ",height="+ myHeight + ", left=" + leftpos + ",top=" + toppos);  

   //focus window
   setTimeout('msgWindow.focus()',1);
}