Changing the hidden value in a javascript function

Hi,
i want to change the hidden elemtn value in the javascript.
the name of the filed will have to be formed in the javascript.

like this

var temp="name"+1;

document.[B]temp[/B].value="newname";

i want temp to be replaced by name1 so that the value of name1 
field shud change.like 
this "[B]document.name1.value="newvalue" [/B] "

Code (markup):

<input type='hidden' name='name1' value'Val'>

Code (markup):

 

<input type="hidden" name="name1" value="Val" id="myID"/>

PHP:

var temp="name"+1;
document.getElementById('myID').setAttribute('name',temp);
document.getElementById('myID').value = "newvalue";

PHP:

i dont test this..

 

thanks a lot...it worked...