after reviewing the initial post and this last 2, you are actually going to need to use some javascript, however it will not be accessible to everyone, because every user can disable javascript if they so choose. if you had access to a server-side language like php this could be done, however i am going to assume that you dont, so below is the client-side method
Code:
<script type="javascript">
function goToPage(var url = '')
{
var initial = "http://www.domain.com";
var extension = "html";
window.location(initial+url+extension);
}
</script>
<form name="something" action="#">
Label <input type="text" name="url" value="" onchange="goToPage(this.value)">
</form>
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