function DisableEnter(e) 
{
    // Prevents Enter keypress outside controls from causing unintended submit actions. 
    // Can be overridden on specific controls to allow default submit actions.
    var key;
    if (window.event)
        key = window.event.keyCode;  // IE
    else
        key = e.which  //Firefox
        
    if (key == 13)
        return false;
    else
        return true;
}

// Handles enter key behavior
function ClickButtonUponEnterKeyPress(e, buttonId)
{ 
    var key;
    if (window.event)
        key = window.event.keyCode;
    else
        key = e.which;
        
    if (key == 13)
    {
        var button = document.getElementById(buttonId);
        if (button != null)
        {
            button.click();
            event.keyCode = 0;
        }
    }
}

// Displays a pop-up message on forms that fail validation
function errorPrompt(errorMessage)
{
    alert(errorMessage);
}

// Use to enforce maxlength on multi-line text boxes        
function LimitInput(control, maxlength)
{
    if(control.value.length >= maxlength)
    {
        control.value = control.value.substring(0,maxlength);
    }
}

// -- Functions used in the Catalog Products page --

// Upon selection/deselection of checkbox in an item row, set quantity to blank or to one.
function AddToCartCheckBox_onClick(addToCartCheckBox, productQuantityTextBoxID)
{
    var productQuantityTextBox = document.getElementById(productQuantityTextBoxID);
    var productQuantityTextBoxValue = "" + productQuantityTextBox.value;
    if (addToCartCheckBox.checked && productQuantityTextBoxValue == "") 
    {
        productQuantityTextBox.value = 1;
    }
    else if (!addToCartCheckBox.checked)
    {
        productQuantityTextBox.value = "";
    }
}

// Upon change of text in quantity field, select or deselect checkbox appropriately
function ProductQuantityTextBox_onKeyUp(productQuantityTextBox, addToCartCheckBoxID)
{
    var addToCartCheckBox = document.getElementById(addToCartCheckBoxID);
    var productQuantityTextBoxValue = "" + productQuantityTextBox.value;
    if (productQuantityTextBox.value == "" || productQuantityTextBox.value == 0)
    {
        addToCartCheckBox.checked = false;
        productQuantityTextBox.value = "";
    }
    else
        addToCartCheckBox.checked = true;
}

// START DHTML TOOLTIP SCRIPT 

    /***********************************************
    * Cool DHTML tooltip script- © Dynamic Drive DHTML code library (www.dynamicdrive.com)
    * This notice MUST stay intact for legal use
    * Visit Dynamic Drive at http://www.dynamicdrive.com/ for full source code
    ***********************************************/

    var offsetxpoint=-60 //Customize x offset of tooltip
    var offsetypoint=20 //Customize y offset of tooltip
    var ie=document.all
    var ns6=document.getElementById && !document.all
    var enabletip=false
    if (ie||ns6)
    var tipobj=document.all? document.all["dhtmltooltip"] : document.getElementById? document.getElementById("dhtmltooltip") : ""

    function ietruebody(){
    return (document.compatMode && document.compatMode!="BackCompat")? document.documentElement : document.body
    }

    function ddrivetip(thetext, thecolor, thewidth){
    if (ns6||ie){
    if (typeof thewidth!="undefined") tipobj.style.width=thewidth+"px"
    if (typeof thecolor!="undefined" && thecolor!="") tipobj.style.backgroundColor=thecolor
    tipobj.style.zIndex="2000"
    tipobj.innerHTML=thetext
    enabletip=true
    return false
    }
    }

    function positiontip(e){
    if (enabletip){
    var curX=(ns6)?e.pageX : event.clientX+ietruebody().scrollLeft;
    var curY=(ns6)?e.pageY : event.clientY+ietruebody().scrollTop;
    //Find out how close the mouse is to the corner of the window
    var rightedge=ie&&!window.opera? ietruebody().clientWidth-event.clientX-offsetxpoint : window.innerWidth-e.clientX-offsetxpoint-20
    var bottomedge=ie&&!window.opera? ietruebody().clientHeight-event.clientY-offsetypoint : window.innerHeight-e.clientY-offsetypoint-20

    var leftedge=(offsetxpoint<0)? offsetxpoint*(-1) : -1000

    //if the horizontal distance isn't enough to accomodate the width of the context menu
    if (rightedge<tipobj.offsetWidth)
    //move the horizontal position of the menu to the left by it's width
    tipobj.style.left=ie? ietruebody().scrollLeft+event.clientX-tipobj.offsetWidth+"px" : window.pageXOffset+e.clientX-tipobj.offsetWidth+"px"
    else if (curX<leftedge)
    tipobj.style.left="5px"
    else
    //position the horizontal position of the menu where the mouse is positioned
    tipobj.style.left=curX+offsetxpoint+"px"

    //same concept with the vertical position
    if (bottomedge<tipobj.offsetHeight)
    tipobj.style.top=ie? ietruebody().scrollTop+event.clientY-tipobj.offsetHeight-offsetypoint+"px" : window.pageYOffset+e.clientY-tipobj.offsetHeight-offsetypoint+"px"
    else
    tipobj.style.top=curY+offsetypoint+"px"
    tipobj.style.visibility="visible"
    }
    }

    function hideddrivetip(){
    if (ns6||ie){
    enabletip=false
    tipobj.style.visibility = "hidden"
    tipobj.style.zIndex="2000"
    tipobj.style.left="-1000px"
    tipobj.style.backgroundColor=''
    tipobj.style.width=''
    }
    }

    document.onmousemove=positiontip
   
// END DHTML TOOLTIP SCRIPT