function popupwindow(){
var winTop = (screen.height/2) - 300;
var winLeft = (screen.width/2) - 395;
var windowFeatures = "height=515,width=775,menubar=0,resizable=0,scrollbars=0,status=0,titlebar=0,toolbar=0,left=30,top=30,"
windowFeatures = windowFeatures + "left=" + winLeft + "," + "top=" + winTop;
marketSight = window.open("demo/marketsight.html", "newWindow", windowFeatures);
marketSight.focus();
}