problem with javascript in portal

[srinivas-s]

I am trying to get the value of a textbox using javascript

It works in a plain web application

It is not working in Weblogic Portal 9.2 portlets

here is the sample code

function dstcheck(tagname)
{
alert(document[lookupIdByTagId("sampleForm", this)][lookupIdByTagId("textID", 
this)].value);
}