plz help me verify this... calling function

<jsp:useBean id = "pc" class="common.claim" scope="request" />
 
 
<script language="javascript">
function chkQty(x)
	{
		if(eval("document.breakdown.b_progQty"+x+".value") == '')
		{
			alert("The progress to date quantity do not have value.");
			eval("document.breakdown.b_progQty"+x).focus();
		}
		else
		if(eval("document.breakdown.b_progQty"+x+".value") < qty)
		{
			alert("The entered value for progress to date quantity is less then previous value.");
			eval("document.breakdown.b_progQty"+x).value = qty;
			eval("document.breakdown.b_progQty"+x).focus();
		}
		else
			calcQtyPect(x);
	}
 
 
 
function calcQtyPect(p)
	{
		<%
		qty = request.getParameter("b_progQty"+p);
		laqty = request.getParameter("b_laQty"+p);
		
		calPect = pc.calcQtyPect(qty,laqty);
		%>
		eval("document.breakdown.b_progPect"+p).value = calPect;
	}
 
</script>
 
<input type="text" size=8 name="b_progQty<%=c%>" id="progLump" value='<%=b_progQty.elementAt(c)%>' style="text-align:right;background:#ffffcc" onChange="chkQty(<%=c%>);">

Code (markup):

plz help me to verify the above coding whether correct or not.
thx.