function UpdateTotal(FieldName, Amt, Section) {

	var OldAmt;
	
	OldAmt = eval('document.form1.T_'+FieldName).value;

	if (isNaN(OldAmt)) {
		OldAmt=0;
	}
	
	if (isNaN(Amt)) {
		Amt=0;
	}
	eval('document.form1.T_'+FieldName).value = eval('document.form1.T_'+FieldName).value - OldAmt + Amt;
	eval('document.form1.ST_'+Section).value = eval('document.form1.ST_'+Section).value - OldAmt + Amt;
	document.form1.SubTotal.value= document.form1.SubTotal.value  - OldAmt + Amt

}