function isCompletedField( field, alerttxt ) {
	with (field) {
		if (tagName=='SELECT'){
			if (selectedIndex<0) {
				alert(alerttxt);
				return false; 
			}
		}
		else {
			if (value==null||value=="") {
				alert(alerttxt);
				return false;
			}
		}
		return true;
	}
}
function isValidEmail( field, alerttxt ) {
	with (field) {
	  apos=value.indexOf("@");
	  dotpos=value.lastIndexOf(".");
	  if (apos<1||dotpos-apos<2) {
		alert(alerttxt);
		return false;
	  }
	  else {
		return true;
	  }
	}
}