function newopenbysize(url,target,width,height){
        var tt,w,left,top;

        left=(screen.width-width)/2;
        if(left<0){ left=0;}

        top=(screen.height-height)/2;
        if(top<0){ top=0;}

        tt="toolbar=no, menubar=no, scrollbars=no,resizable=yes,location=no, status=no,";
        tt=tt+"width="+width+",height="+height+",left="+left+",top="+top;
        w=window.open(url,target,tt);
        //w.focus();
}