dynamic href destination

[mjunior]

Hello,

Anyone knows how to do a dynamic href destination based on a input value?

I have a form that allows user to pick a picture (that shows a thumb preview presentation)...I'd like to do href to that picture in order to show it in full screen when clicked..
I'm stuck on the dynamic reference to the href destination...

>> the input I'd like to refer:
<input type="file" name="picField" id="picField" onchange="preview(this)" size="10" >

>> the href:
<a href="javascript: form.picField.value" rel="lightbox" title=""><img src="spacer.gif" alt="Preview da imagem" name="previewField" border="0" id="previewField"></a>

[php_daemon]

<a href="javascript:location.href=form.picField.value" rel="lightbox" title="">

[mjunior]

the href is working now..but the rel="lightbox" don't...

How can I pass the rel attribute on your suggestion?