function isNotEmpty(elem){
	var str = elem.value;
	var re = /.+/;
	if(!str.match(re)){
		return false;
	} else {
		return true;
	}
	
}

function isNumber(elem){
	var str = elem.value;
	var re = /^[-]?\d*\.?\d*$/;
	str = str.toString();
	if(!str.match(re)){
		return false;
	}
	return true
}

function isEmailAddr(elem){
	var str = elem.value;
	var re = /^[\w-]+(\.[\w]+)*@([\w-]+\.)+[a-zA-Z]{2,7}$/;
	if(!str.match(re)){
		return false;
	} else {
		return true;
	}
}


function feedbackCheck(formobj){
	// name of mandatory fields
	var fieldRequired = Array("name", "email", "phone", "message");
	// field description to appear in the dialog box
	var fieldDescription = Array("Name", "Email address", "Phone number", "Message");
	// dialog message
	var alertMsg = "Please complete the following fields:\n";
	
	var l_Msg = alertMsg.length;
	
	for (var i = 0; i < fieldRequired.length; i++){
		var obj = formobj.elements[fieldRequired[i]];
		if (obj){
			switch(obj.type){
			case "text":
			case "password":
			case "textarea":
				if (obj.value == "" || obj.value == null){
					alertMsg += " - " + fieldDescription[i] + "\n";
				}
				break;
			default:
			}
			if (obj.type == undefined){
				var blnchecked = false;
				for (var j = 0; j < obj.length; j++){
					if (obj[j].checked){
						blnchecked = true;
					}
				}
				if (!blnchecked){
					alertMsg += " - " + fieldDescription[i] + "\n";
				}
			}
		}
	}

	// special snippet for valid email check. * requires order_func.js
	if(isNotEmpty(formobj.email)){
			if(!isEmailAddr(formobj.email)){ alertMsg += "- Enter a valid Email Address\n"; }
	} // end of snippet

	// special snippet for valid phone no check. * requires order_func.js
	if(isNotEmpty(formobj.phone)){
			if(!isNumber(formobj.phone)){ alertMsg += "- Enter only numbers in the 'Phone number' field\n"; }
	} // end of snippet

	if (alertMsg.length == l_Msg){
		return true;
	}else{
		alert(alertMsg);
		return false;
	}

}