function sort_by(selectobj){
  var sort_order = selectobj[selectobj.selectedIndex].value;
  var url =  window.location.href;
  var tempArray = url.split("?");
  var baseURL = tempArray[0];
  
  switch(sort_order){
  	case '1': window.location.href = baseURL + "?order_by=price&order=ASC&option=1";break 
  	case '2': window.location.href = baseURL + "./?order_by=price&order=DESC&option=2";break;
  	case '3': window.location.href = baseURL + "./?order_by=name&order=ASC&option=3";break;
  	case '4': window.location.href = baseURL + "./?order_by=name&order=DESC&option=4";break;
  	case '5': window.location.href = baseURL + "./?order_by=id&order=ASC&option=5";break;
  	case '6': window.location.href = baseURL + "./?order_by=id&order=DESC&option=6";break;
   }
  //alert(sort_order);
}