function check_email(e) {
		ok = "1234567890qwertyuiop[]asdfghjklzxcvbnm.@-_QWERTYUIOPASDFGHJKLZXCVBNM";

		for(i=0; i < e.length ;i++){
			if(ok.indexOf(e.charAt(i))<0){ 
				return (false);
			}	
		} 

		if (document.images) {
			re = /(@.*@)|(\.\.)|(^\.)|(^@)|(@$)|(\.$)|(@\.)/;
			re_two = /^.+\@(\[?)[a-zA-Z0-9\-\.]+\.([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)$/;
			if (!e.match(re) && e.match(re_two)) {
			return (-1);		
			} 
		}
	}
	
	function check_quote_form(f) {
		if (f.name.value == "") {
			alert("Please specify your first name");
			return false;
		}
		if (f.surname.value == "") {
			alert("Please specify your surname");
			return false;
		}
		if (f.delivery_time.value == "") {
			alert("Please enter a delivery time");
			return false;
		}
		if (f.delivery_address.value == "") {
			alert("Please enter the delivery address");
			return false;
		}
		if (f.pickup_address.value == "") {
			alert("Please enter pick-up location");
			return false;
		}
		if (f.telephone.value == "") {
			alert("Please enter your telephone number");
			return false;
		}
		
	}
	
	function check_reservation_form(f) {
		if (f.name.value == "") {
			alert("Please specify your first name");
			return false;
		}
		if (f.surname.value == "") {
			alert("Please specify your surname");
			return false;
		}
		if (f.telephone.value == "") {
			alert("Please enter your telephone number");
			return false;
		}
	}
	
	function check_corporate_form(f) {
		return check_reservation_form(f);
	}