//image rollovers on the nav bar
//preload images
function preload(){
	var imagesA=new Array("images/but_about_norm.gif", "images/but_food_norm.gif", "images/but_people_norm.gif", "images/but_tips_norm.gif", "images/but_contact_norm.gif","images/but_about_over.gif", "images/but_food_over.gif", "images/but_people_over.gif", "images/but_tips_over.gif", "images/but_contact_over.gif");
	var imagesB = new Array();
	for(i=0;i<imagesA.length; i++){
		imagesB[i] = new Image();
		imagesB[i].src = imagesA[i];
	}
}


//store original images
var imagesNormal=new Array("images/but_about_norm.gif", "images/but_food_norm.gif", "images/but_people_norm.gif", "images/but_tips_norm.gif", "images/but_contact_norm.gif");
//store rollover images
var imagesOver=new Array ("images/but_about_over.gif", "images/but_food_over.gif", "images/but_people_over.gif", "images/but_tips_over.gif", "images/but_contact_over.gif");
var imageName
var imageIndex	

function rollover(theButton, imageIndex){
	theButton.src=imagesOver[imageIndex];
}

function rollout(theButton, imageIndex){
	theButton.src=imagesNormal[imageIndex];
}

// end of nav bar rollover functions
			
function checkdata(formObj) {
	if(emptyfield(formObj.custname)){
		formObj.custname.focus();
		alert("Please enter your name");
		return false;
	}
	else if(emptyfield(formObj.email)){
		formObj.email.focus();
		alert("Please enter your email address");
		return false;
	}
	else if (checkemail(formObj.email.value)){
		formObj.email.focus();
		alert("Please enter a valid email address");
		return false;
	}
	
	else if(emptyfield(formObj.phone)){
		formObj.phone.focus();
		alert("Please enter your contact phone number");
		return false;
	}
	return true; 
	
}

function emptyfield(fieldObj){
	var result = true;
	if (fieldObj.value.length ==0){
		result = true;
	}
	else {
		var i, ch;
		for(i=0;i<fieldObj.value.length;i++){
			ch=fieldObj.value.charAt(i);
			if(ch!=' ' && ch != '\t'){
				result = false;
				break;
			}
		}
	}
	return result;
}

function checkemail(email){
	var checkExp = /^[0-9a-zA-Z-_\.]+@[0-9a-zA-Z-\.]+\.[a-z]{2,3}$/;
	if (checkExp.test(email)){
		var result = false;
	}
	else {
		var result = true;
	}
	return result;
}