I am having trouble figuring out how to correct this error, i think i
have narrowed it down to what function is causing the issue, since
once i comment it out, it doent give the error, but the code no longer
does what its supposted to. Whats weird is that the code works how it
should even with the error, but i dont want any errors even if they
arnet effecting anything... well here is the code:

$(document).ready(function(){
//every time a textbox is clicked or focused...
$('.tbox').bind('click focus',function(){
//get the focused textbox's outer border
var targetThis = $(this).parent().parent().parent().parent();
HandleBlueMe(targetThis ,true);
});
function HandleBlueMe(CurrentBoxWithInput,blnOn){
if(CurrentBoxWithInput != null){
if(blnOn == true){
removePreviousFocusedBlue(CurrentBoxWithInput);

activateBlue(CurrentBoxWithInput);
}else if(blnOn == false){
deactivateBlue(CurrentBoxWithInput);
}
}
}

function activateBlue(Box){
//debugger;
$(Box).select('.box').addClass('active');
}

function deactivateBlue(Box){
$(Box).select('.box').removeClass('active');
}

function removePreviousFocusedBlueForInput(){
$('.sprite > .box').removeClass('active');
}

function removePreviousFocusedBlue(CurrentBoxWithInput){
if(CurrentBoxWithInput != null && $(CurrentBoxWithInput).select
('.box').length > 0){
//alert('remove input blue input');
removePreviousFocusedBlueForInput();
}else{alert('CurrentBoxWithInput = null or length is less than
zero');}
}

function GetInputContainer(input){
try{
return $(input).parent().parent().parent().parent();
}catch(ex){
alert("JAVASCRIPT ERROR FAILED TO GET INPUT CONTAINER:
"+ex.message);
}
return null;

}

here is a sample of the HTML that it is using:
<div class="sprite inputOne">
<div class="box textbox" id="boxOne">
<div class="topcorners">
<div>
<div></div>
</div>
</div>
<div class="middle">
<div class="left">
<div class="right group1">
<input class="inputBox tbox regemail rec" id="Name"
required="true" title="Full Name"/>
</div>
</div>
</div>
<div class="bottomcorners">
<div>
<div></div>
</div>
</div>
</div>