var strCurrentImage='';

function setArrowImage(strImagename) {
     document.arrow_up_email.src	= 'images/emptywhite.gif';
     document.arrow_up_history.src	= 'images/emptywhite.gif';
     document.arrow_up_rsvp.src		= 'images/emptywhite.gif';
     document.arrow_up_register.src	= 'images/emptywhite.gif';
     document.arrow_up_callentries.src  = 'images/emptywhite.gif';
     document.arrow_up_program.src	= 'images/emptywhite.gif';
     document.arrow_up_sponsors.src	= 'images/emptywhite.gif';

     eval('document.'+strImagename+'.src=\'images/navbar_arrowup.gif\';');
     document.strCurrentImage = strImagename;
     return;
}

function clearImage(strImagename) {
     if (strImagename != document.strCurrentImage) {
          eval('document.'+strImagename+'.src=\'images/emptywhite.gif\';');
     }
}