function validate(field,alerttxt)
{
with (field)
{
apos=value.indexOf("@");
dotpos=value.lastIndexOf(".");
if (apos<1||dotpos-apos<2) 
	{alert(alerttxt);return false;}
else {
	return true;}
}
}

function validate_form(thisform)
{
with (thisform)
{
if (validate(email,"You must enter a valid email address")==false)
  {email.focus();return false;}
if (validate2(name,"You must enter a name")==false)
  {name.focus();return false;}
if (validate4(venue,"You must select a venue")==false)
  {name.focus();return false;}
}
}