how to get the size of the same siblings

[srinu reddyreddy]

<report>
    <parameters>
    <parameter>
    <key>quarter</key>
    <value>1</value>
    <value>2</value>
    <value>srinu</value>
    </parameter>
    <parameter>
    <key>department</key> 
    <value>aa</value>
    <value>bb</value>
    </parameter>
    </parameters>

i am writing the following logic to iterate through the value nodes,
but it is throwing exception,pls suggest me
error is here:

while(currentChild.nextSibling.nodeName="value")
                                {
                                currentChild = currentChild.nextSibling;
                                sValue=currentChild.firstChild.nodeValue;
                                alert("while"+sValue);
                                }

it is giving the following error
Error: setting a property that has only a getter
Source File: http://localhost:8080/example/edit.jsp
Line: 80

[Eric Pascarello]

= is store
== is compare

Eric