Object Undefined Error

Drop down:
function setLBValues(whichBoxSelected)
{
	/*
	---------------------------------------------------------------------------------------------
	Set the list box selected values from the hidden form element values. 

	If this invocation was triggered by the static focus() code in the last Javascript (from 
	the server), the bsubmitFocus variable will be false and the form will not be submitted.

	If this invocation was triggered by a setfocus() resulting from a mouse or keyboard event, 
	then bsubmitFocus will be true and the form will be submitted.   
	---------------------------------------------------------------------------------------------
	*/
	theBoxSelected = whichBoxSelected.name.charAt(3);
	var lbStart = parseInt(theBoxSelected);
	document.frmHWSW.lbFocus.value = theBoxSelected;
	if (lbStart < 3)
	{
		endPoint = lbHWEnd;
	}	
	else
	{
		endPoint = lbSWEnd;
	}	

	document.frmHWSW.selBox0.value 		= document.frmHWSW.sel0.selectedIndex;
	document.frmHWSW.selBox1.value 		= document.frmHWSW.sel1.selectedIndex;
	document.frmHWSW.selBox2.value 		= document.frmHWSW.sel2.selectedIndex;
	document.frmHWSW.selBox3.value 		= document.frmHWSW.sel3.selectedIndex;
	document.frmHWSW.selBox4.value 		= document.frmHWSW.sel4.selectedIndex;
	document.frmHWSW.selBox5.value 		= document.frmHWSW.sel5.selectedIndex;
	document.frmHWSW.ListBoxNo.value	= whichBoxSelected.name.charAt(3);
	
		
	if (bsubmitFocus)
	{
		bsubmitFocus = false;
		document.frmHWSW.submit();
	}
	else
	{
		bsubmitFocus = true;
	}
}

Text Box:
function setBox5(whichBoxSelected)
{
	theBoxSelected5 = 5
	var lbStart = parseInt(theBoxSelected5);
	document.frmHWSW.lbFocus.value = document.frmHWSW.HWStartYear;
	document.frmHWSW.selBox5.value = document.frmHWSW.sel5.selectedIndex;
	
	if (bsubmitFocus)
	{
		bsubmitFocus = false;
		document.frmHWSW.submit();
	}
	else
	{
		bsubmitFocus = true;
	}
}