function lightup(imgName)
 {
   if (document.images)
    {
      imgOn=eval(imgName + "on.src");
      document[imgName].src= imgOn;
    }
 }

function turnoff(imgName)
 {
   if (document.images)
    {
      imgOff=eval(imgName + "off.src");
      document[imgName].src= imgOff;
    }
 }

function validatecontactform ()
{
	var err=0;
	var errMsg="";
	if (document.frm.txtName.value=="")
	{
		alert ("Enter your name.");
		err=1;
		document.frm.txtName.focus();
	}
	else if (document.frm.txtEmail.value=="")
	{
		alert ("Enter your email address.");
		err=1;
		document.frm.txtEmail.focus();
	}
	
	if (err==0)
	{
		document.frm.action="tools.asp";
		document.frm.submit();
	}
}