function urlMain(url)
{
  top.winMain = window.open(url,'mainWin');
  top.winMain.focus();
}
function urlHelp(url)
{
  top.winHelp = window.open(url,'Help','scrollbars=yes,width=450,height=550,left=10,top=20');
  top.winHelp.focus();
}
function urlPrint(url)
{
  top.winPrint = window.open(url,'Print','scrollbars=yes,width=700,height=550,left=10,top=20');
  top.winPrint.focus();
}
function urlImageviewer(url)
{
  top.winImageviewer = window.open(url,'imageviewer','status=yes,scrollbars=yes,resizable=yes,width=600,height=500');
  top.winImageviewer.focus();
}