A dropdown column not coming into view when focused, in IE7

[sdawar]

I have a dataTable in which on the keyup event, the cursor focuses to the next field. In IE7, after a field, the next field is not coming into the view. Please help.
The occField(2nd attachment) comes into view only after focus moves to next field, i.e LTD Buy up.

if (currId.indexOf("Occ") >= 0)
		{
			if(stdBuyUpSelected){
				autoTabFocus("SBuy",index);
			}else if(ltdBuyUpSelected){
				autoTabFocus("LBuy",index);
			}
			else if (isStateZipDisp){
				autoTabFocus("Zp",index);
			}

		}


function autoTabFocus(next,index)
{
	var focusElem = document.getElementById(next+index);
	if (focusElem != null)
	{
		focusElem.focus();		
	}
}