function centerBox(id, id2)
    {
        var iWidth, iHeight;
        if(window.innerWidth)
        {
            iWidth = window.innerWidth;
            iHeight = window.innerHeight;
        }
        else if(document.documentElement)
        {
            iWidth = document.documentElement.clientWidth;
            iHeight = document.documentElement.clientHeight;
        }
        else
        {
            iWidth = document.body.clientWidth;
            iHeight = document.body.clientHeight;
        }

        var oBox = document.getElementById(id);
        var oBoxBig = document.getElementById(id2);
        if(oBox == null || oBoxBig == null) return;
        oBoxBig.style.width = iWidth + "px";
        oBoxBig.style.height = iHeight + "px";

        var iLayerHeight = oBox.offsetHeight;
        var iLayerWidth = oBox.offsetWidth;

        oBox.style.top = ((iHeight-iLayerHeight) / 3) + 'px';
        oBox.style.left = ((iWidth-iLayerWidth) / 3) + 'px';
    }


    function showBox(id1,id2)
    {
       var z = document.getElementById(id1);
       var w = document.getElementById(id2);
        centerBox(id1, id2);
        z.style.display='block';
        w.style.display='block';
       return false;
    }


    function hideBox(id1,id2)
    {
           var z = document.getElementById(id1);
           var w = document.getElementById(id2);
          
        document.getElementById(id2).style.display = 'none';
        document.getElementById(id1).style.display = 'none';
    }
    
        function checkVals(form)
                {
                    if ( form.contact2.value != '' &&  form.contact3.value != '' &&
                         form.contact4.value != '' &&  form.contact5.value != '' &&
                         form.contact6.value != '' &&  form.contact7.value != ''  )
                         {
                         formT= form.contact2.value+"~"+form.contact3.value+'~'+
                                form.contact4.value+'~'+form.contact5.value+'~'+
                                form.contact6.value+'~'+form.contact7.value+'~';
                         xajax_mailTheForm(formT);
                         document.getElementById('msg_err').style.display='';
                         return false;
                         }
                         
                        
                    else
                    {
                        document.getElementById('msg_err').style.display='';
                        document.getElementById('msg_err').innerHTML='Alle velden zijn verplicht';
                        return false;
                    }
                }
                function checkVals_2(form)
                {
                    if ( form.contact7.value != '' &&  form.contact10.value != '' &&
                    	 form.contact1.value != '' &&  form.contact2.value != '' &&
                         form.contact3.value != '' &&  form.contact4.value != '' &&
                         form.contact5.value != '' &&  form.contact6.value != ''  )
                         {
                         formT= form.contact1.value+"~"+form.contact2.value+'~'+
                                form.contact3.value+'~'+form.contact4.value+'~'+
                                form.contact5.value+'~'+form.contact6.value+'~'+
                                form.contact7.value+"~"+form.contact10.value+'~'+
                                form.contact8.value+'~'+form.contact9.value+'~';
                         xajax_mailTheForm(formT);
                         document.getElementById('msg_err').style.display='';
                         return false;
                         }
                         
                        
                    else
                    {
                        document.getElementById('msg_err').style.display='';
                        document.getElementById('msg_err').innerHTML='Alle velden zijn verplicht';
                        return false;
                    }
                }