codice:
<script>
function cercaprodotto(){
var URL = 'https://www.suppliesnow.nl/?lid=2&tc=search&search='
var cod = document.getElementById('codsam').value
window.open(URL+cod,'popcodici');
}
</script> 
<center>


<h1>Ricerca articoli Samsung</h1></p>
<form name="form" target="popcodici" action="#" method="POST" onsubmit="cercaprodotto()">
<input type="text" value="" size="15" name="codsam" id="codsam" /> 

<input type="submit" value="Cerca"/>                             
</form>
</center>