how to access an object in a form with getElementById?

[Carl]

Assume a form with a button

<form id="myform"
<input id="mybutton" type="button">
</form>

how can i use getElementById to access the button?
I tried this:
var a
a=document.getElementById("mybutton")

but i get an error "a is not an object"
Any idea?
Carl

 

[Vjekoslav Begovic]

Assume a form with a button

<form id="myform"

Missing ">".

 

[Carl]

yes, it's stupid, thanks