function validate_search(form)  
{ 
	var e = form.elements, m = '';
	if(!e['search_string'].value) 
	{
		m += '- Search can not be blank.\n\n';
	} 
	if(m) 
	{
		alert('The following error(s) occurred:\n\n' + m);
		return false;
	} 
	return true; 
}