Calling Dynamic Form Name

Code:
formedit.field.value
with this piece of code, i can access a value of a field inside a form. problem is, when i loop, i do this in naming my forms

formedit_1
formedit_2
etc..

on my link, i do this

<a href="jsscript(id)">

but i cant access the proper value. what i would like is that if i pass id=2, then the value from formedit-2 will be taken, if i pass id=1, then the value from formedit_1 will be taken. but i cant make it.. i tried this

var test = 'formedit_' + id;
alert(test.field.value);