function logoff() {
   var Q = confirm("Er du sikker på du vil logge af?")
   if(Q) {
      window.location = "/logoff.php";
   }
}

function toggle(el){
    var div1 = document.getElementById(el)
    if (div1.style.display == 'block') {
        div1.style.display = 'none'
    } else {
        div1.style.display = 'block'
    }
}

function show(id) {
    var element = document.getElementById(id);
    if (element != undefined) {
        element.style.display = 'block';
    }
}

function hide(id) {
    var element = document.getElementById(id);
    if (element != undefined) {
        element.style.display = 'none';
    }
}

//add event function
function addEvent(obj, evType, fn){
 if (obj.addEventListener){
   obj.addEventListener(evType, fn, true);
   return true;
 } else if (obj.attachEvent){
   var r = obj.attachEvent("on"+evType, fn);
   return r;
 } else {
   return false;
 }
}

// Find all link elements and add an onfocus attribte and value
function hideFocusBorders(){
var theahrefs = document.getElementsByTagName("a");
if (!theahrefs){return;}
for(var x=0;x!=theahrefs.length;x++){
theahrefs[x].onfocus = function stopLinkFocus(){this.hideFocus=true;};
}
}

//event added using the addEvent() function above
addEvent(window, 'load', hideFocusBorders);

/* Shopping cart */
function getMultiElement(elementId) {
    if (document.layers) {
        // Opera
        return document.layers[elementId];
    } else if (document.all) {
        //Internet Explorer
        return document.all[elementId];
    } else if (document.getElementById) {
        //Firefix, Safari, Netscape
        return document.getElementById(elementId);
    }
}

function numbersonly(e) {
    var unicode = e.charCode ? e.charCode : e.keyCode;

    if (unicode == 8 || unicode == 9 || (unicode >= 48 && unicode <= 57)) { //if not a number
        return true;
    }
    return false;
}

function changeImage(src){
    var obj = document.getElementById('prod_img');
    obj.src = src;
}

function changeHref(href){
    document.getElementById('chli').href = href;
}

function changeFieldValue(field_id, default_value, new_value) {
    if (document.getElementById(field_id).value == default_value) {
        document.getElementById(field_id).value = new_value;
    }
}