function goto_shop() {
    var p_b_q = document.getElementById("p_b_q[1]").value; 
    var p_b_a = document.getElementById("p_b_a[1]").value;

    document.getElementById("form1").action = 'http://www.conrad-electronic.be/om/?url='+encodeURIComponent("http://www.conrad-electronic.be/goto/?p_b_q[1]=" + p_b_q + "&p_b_i[1]=8Z&p_b_a[1]=" + p_b_a + "&submit=Bestellen&adcampaign=otm");

    /* alert(document.getElementById("form1").action); */
}