Javascript  problem in jsp

my jsp is as:
<select size="1" name="Bookcode" id="fp8"   onchange="onCall()"  style="border: 1px solid #000080">
<option value1=<%=btdto[0].getBookIssueDate()%>
                             value2=<%=btdto[0].getBookRenwDate()  %>>
                             <%=bCode%>
                     </option>
</select>
my javascript is as:
function onCall()
                    var idate=document.book_renewal.Bookcode.options[document.book_renewal.Bookcode.selectedIndex].value1;
                    var rdate=document.book_renewal.Bookcode.options[document.book_renewal.Bookcode.selectedIndex].value2;
                    alert("idate");
                    document.book_renewal.idate1=idate;alert("rdate");
                    document.book_renewal.idate2=rdate;
               }it is giving alert("idate"), but giving alert("rdate")
i am getting an error in javascript as:
Object does not support this method or property
please resolve
thanks

If not specified, the <select> dropdown is single selection. If you want, try set multiple="true" in the select tag. If it is single selection, then the selection.selectedIndex should only have one value. If it is multi-selection, the I assume the selection.selectedIndex will return you an array of items.
Hope this helps!

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