function validate_email(DocName, DocVal){
	if(document.forms[DocName].elements[DocVal].value != ""){
		var field = document.forms[DocName].elements[DocVal];  
		var s_email = trimString(field.value);
		if (!(/^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,3})+$/.test(s_email))){
			document.forms[DocName].elements[DocVal].focus();
			return true;
		}
	}	
	else{
   		return false;
	}	
}

function trimString(str){
	return str.replace(/^\s+/g,'').replace(/\s+$/g,'');
}