//################################################################################################################
//
//	Description:	Checks if a string contains only alpha numeric values

	function gValidString(sString) {

		var sRefString = "~`!@#$%^&*()_-+={[}]|:;'";
		sRefString = sRefString + "<,>.?/\\' '";
		sRefString = sRefString + '"';
		if(sString.length <= 0) return (false);
		for (Count=0; Count < sString.length; Count++) {
			TempChar= sString.substring (Count, Count+1);
			if (sRefString.indexOf (TempChar, 0)!=-1)  
				return (false);
		}
		return (true);
	}

//################################################################################################################
//
//	Description:	Checks to see if string is empty.  String as input, T/F as Result.
//	Inputs:			String
//	Results:		True if empty / null, False otherwise.
//	Comments:		None.
//

	function gIsEmpty(inStr) {
		if (inStr == null || inStr == "") {
			return true;
		}
		return false;
	}

//################################################################################################################
//
//	Description:	Checks if value only contains numbers

	function gNumOnly (InString) {
		var RefString = "0123456789";
		var OutString = "";
		for (Count = 0; Count < InString.length; Count++) {
			Temp = InString.substring (Count, Count+1);
			if (RefString.indexOf(Temp) != -1) {
				OutString += Temp
			}
		}
		return (OutString);
	}

//################################################################################################################

	function Verify_login()
	{
		if ((gValidString(document.login.username.value)) && (gValidString(document.login.password.value)))
		{
			return true;		
		}
		else
		{
			alert("Username and Password must contain only letters and numbers and must be no more than 10 characters in length.");
			return false;
		}
	}
	
	function Verify_register()
	{
		now = new Date();
	
		if (!(gValidString(document.register.username.value)) || !(gValidString(document.register.password.value)))
		{
			alert("Username and Password must contain only letters and numbers and must be no more than 10 characters in length.");
			return false;
		}
		else if (!(document.register.password.value == document.register.confirmation.value))
		{
			alert("Password does not match. Please try again.");
			return false;
		}
		else if (!(gNumOnly(document.register.zip.value)) || (document.register.zip.value.length < 5))
		{
			alert("Zip Code must be a 5 digit numeric value.");
			return false;
		}
		else if (gIsEmpty(document.register.day.value) || isNaN(parseInt(document.register.day.value))) 
		{
			alert("Please enter your birth day. It must be a number.");
			return false;
		}
		else if (gIsEmpty(document.register.year.value) || isNaN(parseInt(document.register.year.value))) 
		{
			alert("Please enter your birth year. It must be a number.");
			return false;
		}
		else if  ((document.register.year.value < 1890) || (document.register.year.value > now.getUTCFullYear()))
		{
			alert("Please enter a valid birth year. It must be a number.");
			return false;
		}
		else
		{
			return true;
		}
	}

	function Verify_teacher_register()
	{
		if (!(gValidString(document.register.username.value)) || !(gValidString(document.register.password.value)))
		{
			alert("Username and Password must contain only letters and numbers and must be no more than 10 characters in length.");
			return false;		
		}
		else if (!(document.register.password.value == document.register.confirmation.value))
		{
			alert("Password does not match. Please try again.");
			return false;
		}
		else if (gIsEmpty(document.register.fullname.value)) 
		{
			alert("Please enter your full name.");
			return false;
		}
		else if (gIsEmpty(document.register.grade.value)) 
		{
			alert("Please enter your grade level.");
			return false;
		}
		else if (gIsEmpty(document.register.schoolname.value)) 
		{
			alert("Please enter your school name.");
			return false;
		}
		else if (gIsEmpty(document.register.city.value)) 
		{
			alert("Please enter your city.");
			return false;
		}
		else if (!(gNumOnly(document.register.zip.value)) || (document.register.zip.value.length < 5))
		{
			alert("Zip Code must be a 5 digit numeric value.");
			return false;
		}
		else
		{
			return true;
		}
	}

//****************************************************************************************************************
//****************************************************************************************************************

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) { //v3.0
  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); 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 onTop() {
  if (window.blur) window.focus();
}

function back(num) {
	history.back(num);
}


function popup(file2open)  {

	var spawn = null;
	var spawn = window.open(file2open, 'popup', 'height=250,width=375,scrollbars=no,resizable=no');
	if (spawn.blur) spawn.focus();
}

function popup2(file2open)  {

	var spawn = null;
	var spawn = window.open(file2open, 'popup', 'height=500,width=600,scrollbars=yes,resizable=yes');
	if (spawn.blur) spawn.focus();
}

function home_popup(file2open)  {

	var spawn = null;
	var spawn = window.open(file2open, 'popup', 'height=460,width=465,scrollbars=no,resizable=no');
	if (spawn.blur) spawn.focus();
}


function sponsor(file2open)  {

	var sponsorWin = null;
	var sponsorWin = window.open(file2open, 'popup', 'height=250,width=450,scrollbars=no,resizable=no');
	if (sponsorWin.blur) sponsorWin.focus();
}

function showPoll()
{
	var poll= null;
	var file2open = "poll.asp";
	poll = window.open(file2open,"results","width=462,height=501,scrollbars=no,resizable=no");
	if (poll.blur) poll.focus();
}

function visitSponsor(url) {
  var sponsorPage = window.open(url,'sponsor');
  //  var sponsorPage = window.open(url,'sponsor','scrollbars,resizable,width=640,height=340,left=40,top=40');
  if (sponsorPage != null) window.close();
  if (whoAmI == 'Netscape' && sponsorPage != null) sponsorPage.focus();
}

function openWin(file2open,h,w)  {

	var game = null;
	//var options = "'" + size + ",scrollbars=no,resizable=no'";
	var game = window.open(file2open, 'newWin', 'width=' + w + ',height=' + h + ',scrollbars=no,resizable=no');
}

function openSurvey(file2open,w,h)  {

	var spawn = null;
	//var options = "'" + size + ",scrollbars=no,resizable=no'";
	var spawn = window.open(file2open, 'newWin', 'width=' + w + ',height=' + h + ',scrollbars=yes,resizable=no');
	if (spawn.blur) spawn.focus();
}

function openWin_full(file2open,h,w)  {

	var newWin = null;
	//var options = "'" + size + ",scrollbars=yes,resizable=yes'";
	var newWin = window.open(file2open, 'newWin', 'width=' + w + ',height=' + h + ',scrollbars=yes,resizable=yes');
	newWin.focus();
}

function openWin3(file2open,h,w) {

	var newIn = null;
	var newWin = window.open(file2open, 'newWin', 'width=' + w + ',height=' + h + ',scrollbars=yes,resizable=yes,menubar=yes,toolbar=yes,status=yes');
	newWin.focus();
}

function openWin4(file2open) {

	var newIn = null;
	var newWin = window.open(file2open, 'newWin', 'scrollbars=yes,resizable=yes,menubar=yes,toolbar=yes,status=yes');
	newWin.focus();
}

function bonepile() {

	var boneWin = null;
	var boneWin = window.open('bonepile.asp', 'bonepile', 'height=400,width=600,scrollbars=no,resizable=no');
}

function doWinFunk(h,w) {
	if (window.screen) {
		var aw = screen.availWidth;
		var ah = screen.availHeight;
		window.moveTo((aw - w) / 2, (ah - h)/2);
		window.resizeTo(w, h);
	}
}

function openWin2(file2open,h,w) {
	if (window.screen) {
  		newWin = window.open('login.asp','win1','width=' + w + ',height=' + h + ',scrollbars=no,resizable=no');
  	}
}

function openRoom(roomName) {
   var file2open= "gsa/" + roomName + ".htm";
   spawn = window.open( file2open, 'room', 'height=400, width=550, scrollbars=no,resizeable=no');
}