Ok, I am lost, dont know if this thread should go into JS or if it can be accomplished using plain html... Here goes..
I need to add a number to a surfer friendly url via an input for that a user types in.
The url is http://property.viriko.com/listing/details/[ID HERE]
The reason I need this is "quick search" when the person knows the number which is required - page with input form is located on http://www.viriko.com
Anyway on accomplishing my goal? Thanks

This can't be done directly by a form because the field name is included in a posted URL, but can be done with a bit of javascript. This could be done with URLs of the form http://..../?property_id=[ID HERE] with this:

<form method="get" action="http://.../">
<input type="text" name="property_id" />
<input type="submit" value="Search" />
</form>

For a javascript solution matching exactly what you've asked for, try

<script>
function propertyIdRedirect() {
  new_url = "http://.../";
  new_url += document.getElementById('property_id').value;
  location.href=new_url;
  return false;
}
</script>
<input type="text" id="property_id" />
<input type="button" value="Search" onClick="return propertyIdRedirect();"/>

Thank you! Your contribution is greatly appreciated and it works perfectly!