function showit(wwidth,wheight,wname) {
    if (wwidth == 0 || wheight == 0)
        showPlace = open("",wname);
    else
     {
     if ( wwidth >790 || wheight >  510 )
        showPlace = open("",wname);
     else
        showPlace = open("",wname,"width="+wwidth+",height="+wheight+",resizable=no,scrollbars=yes");
     }
}