how can i set the src property of iframe using javascirpt

I have 1.1 web form and in that i am using Iframe
now i want to set src property of Iframe using javascript
so wht i want is when user clicks on a button then i want to call this javascript function which i will set src property of the page and then user can see the page in iframe
so how can i set the src property of iframe using javascirpt
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ziorrinfotechAuthor Commented:
hi HuyBD
it does not work

<!doctype html public "-//W3C//DTD HTML 4.0 Transitional//EN">
<body topmargin="0" leftmargin="0" marginwidth="0" marginheight="0">
<iframe name="myframe" src="" width="100%" height=""></iframe>
<form name="frm1" method="post" action="" onsubmit="return ">
<input type="text" name="txt1" value="">
<input type="button" value="Go" onclick="document.frames['myframe'].location=this.form.txt1.value;">

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Michel PlungjanIT ExpertCommented:
window.frames, third...
yes, you are right. why did I do that? ;-) getting rusty everytime I handle another language...
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