//Use example: javascript:launchWS('http://clients.mindbodyonline.com/ws.asp?studioid=6522&stype=-9&sLoc=0&sSU=true');
function launchWS(winName) {
    //window height and width
    myHeight = screen.height * .80;
    myWidth = 784;

    //widow height bounds
    if (myHeight < 556) {
        myHeight = 556;
    } else if (myHeight > 700) {
        myHeight = 700;
    }

    //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);
}