// Rollover functions
function newImage(arg) {
	if (document.images) {
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}

function changeImages() {
	if (document.images && (preloadFlag == true)) {
		for (var i=0; i<changeImages.arguments.length; i+=2) {
			document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
		}
	}
}

var preloadFlag = false;
	function preloadImages() {
		if (document.images) {
			nav_about_on = newImage("images/nav_about-on.gif");
			nav_brews_on = newImage("images/nav_brews-on.gif");
			nav_brewfinder_on = newImage("images/nav_brewfinder-on.gif");
			nav_sweetshop_on = newImage("images/nav_sweetshop-on.gif");
			nav_lounge_on = newImage("images/nav_lounge-on.gif");
			nav_home_on = newImage("images/nav_home-on.gif");	
			nav_beer1_on = newImage("images/beer1-on.jpg");		
			nav_beer2_on = newImage("images/beer2-on.jpg");
			nav_beer3_on = newImage("images/beer3-on.jpg");
			nav_beer4_on = newImage("images/beer4-on.jpg");
			nav_beer5_on = newImage("images/beer5-on.jpg");
			nav_beer6_on = newImage("images/beer6-on.jpg");
			nav_beer7_on = newImage("images/beer7-on.jpg");
			preloadFlag = true;
		}
	}
	
function validateSurvey() {

	var sName				=	document.frmSurvey.vName;
	var sAge				=	document.frmSurvey.vAge;
	var sSex				=	document.frmSurvey.vSex;
	var sLive				=	document.frmSurvey.vLive;
	var sBeerConsumption	=	document.frmSurvey.vBeerConsumption;
	var sMagazines			=	document.frmSurvey.vMagazines;
	var sRadio				=	document.frmSurvey.vRadio;
	
	
	if (sName.value == ''){
		alert("Please provide your name!");
		sName.focus();		
		return false;}
	
	if (sAge.value == ''){
		alert("Please provide your age!");
		sAge.focus();		
		return false;}
		
	if (sSex.value == ''){
		alert("Please enter your sex!");
		sSex.focus();		
		return false;}	
		
	if (sBeerConsumption.value == ''){
		alert("Please enter the number of beers you drink!");
		sBeerConsumption.focus();		
		return false;}		
}

function validateFeedback() {

	var sName				=	document.frmFeedback.vName;
	var sEmail				=	document.frmFeedback.vEmail;
	var sComments			=	document.frmFeedback.vComments;
	
	
	if (sName.value == ''){
		alert("Please provide your name!");
		sName.focus();		
		return false;}
	
	if (sEmail.value == ''){
		alert("Please provide your email address!");
		sEmail.focus();
		return false;	
	}	
	else
	{	
		// test if valid email address, must have @ and .
		var checkEmail = "@.";
		var checkStr = sEmail.value;
		var EmailValid = false;
		var EmailAt = false;
		var EmailPeriod = false;
		for (i = 0;  i < checkStr.length;  i++)
		{
			ch = checkStr.charAt(i);
			for (j = 0;  j < checkEmail.length;  j++)
			{
				if (ch == checkEmail.charAt(j) && ch == "@")
				EmailAt = true;
				if (ch == checkEmail.charAt(j) && ch == ".")
				EmailPeriod = true;
			  	if (EmailAt && EmailPeriod)
					break;
			  	if (j == checkEmail.length)
					break;
			}
			// if both the @ and . were in the string
			if (EmailAt && EmailPeriod)
			{
				EmailValid = true
				break;				
			}
			
		}
		if (!EmailValid)
		{
			alert("The email field must contain an \"@\" and a \".\".\n");
			sEmail.focus();
			return false;	
		}
	}
		
	if (sComments.value == ''){
		alert("Please enter your sex!");
		sComments.focus();		
		return false;}		
}

function openWindow(url){
	var w = 400;
	var h = 320;
	var x = ((screen.width-w)/2);
	var y = ((screen.height-h)/2);
	window.open(url,'','screenx='+x+',screeny='+y+',left='+x+',top='+y+',width='+w+',height='+h+',scrollbars=no,location=no,resizable=no,toolbar=no,menubar=no',false);
}



function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}

function MM_swapImgRestore() { //v3.0
  var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}

function MM_findObj(n, d) { //v4.01
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && d.getElementById) x=d.getElementById(n); return x;
}

function MM_swapImage() { //v3.0
  var i,j=0,x,a=MM_swapImage.arguments; document.MM_sr=new Array; for(i=0;i<(a.length-2);i+=3)
   if ((x=MM_findObj(a[i]))!=null){document.MM_sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
}

function openNewWindow(theURL,winName,features) { //v2.0
  window.open(theURL,winName,features);
}