function addtocart(prodid) {
  var color=document.getElementById("color");
  var size=document.getElementById("size");
  var quantity=document.getElementById("quantity");
  var wishlist=document.getElementById("wishlist");
  var str="p="+prodid;
  if (size) {
    if (!size.value) {  
      alert("Size must be selected. Please complete the required fields and resubmit.");
      return;
    }
    str=str+"&s="+escape(size.value);
  }
  if (color) {
    if (!color.value) {
      alert("Color must be selected. Please complete the required fields and resubmit.");
      return;
    }
    str=str+"&c="+escape(color.value);
  }
  str=str+"&n="+quantity.value+"&w="+wishlist.value;
  window.location.href="/addtocart?"+str;
}