function check()
{ 
  if (form1.Quantity.value<=0)
    {  alert(" Quantity must bigger than zero");
    return false;}
  if (form1.Quantity.value>=999)
    {  alert(" too big number");
    return false;}
    }   

// the object that you are dragging:
var srcObj = new Object;

// string to hold source of object being dragged:
var dummyObj;

function startDrag(){
    // get what is being dragged:
    srcObj = window.event.srcElement;

       dummyObj = srcObj.outerHTML;

    var dragData = window.event.dataTransfer;

    dragData.setData('Text', window.event.srcElement.src);
    dragData.effectAllowed = 'linkMove';
        dragData.dropEffect = 'move';
}

function enterDrag() {
       window.event.dataTransfer.getData('Text');
}

function endDrag() {
       window.event.dataTransfer.clearData();
}

function overDrag() {
        window.event.returnValue = false;
}

function drop() {
        window.event.returnValue = false;
   
    form1.submit()
    
    productBarStatus.innerHTML = '<b>' + srcObj.myLabel + '<\/b> has been added to the shopping cart.';
}