function popup( url , name , width , height ){
    var top = (screen.height - height) / 2; 
    var left = (screen.width - width) / 2;     
    var winProps = "status=no, menubar=no, location=no, resizable=no, dependent=no, scrollbars=no, titlebar=no ,  height="+height+", width="+width+", top="+top+", left="+left;
    //alert( winProps );

    newwindow = window.open( url, name , winProps );

    if (window.focus) {
        newwindow.focus();
    }
	return false;
    
}