function trimall(data)
{
  var datastr = data;
  var leftspace = datastr.search(/\S/gi);
  if (leftspace > 0)
  {
    datastr = datastr.substr(leftspace);
  }

  leftspace = datastr.search(/\s/gi);
  var rightspace = 0;
  var endspace = 0;
  
  var leftstr = datastr;
  while (leftspace != -1) {
    rightspace = rightspace + leftspace;
    leftstr = leftstr.substr(leftspace);
    leftspace = leftstr.search(/\S/gi);
    if (leftspace != -1) {
      rightspace = rightspace + leftspace;
      leftstr = leftstr.substr(leftspace);
      leftspace = leftstr.search(/\s/gi);
      endspace = 0;
    } else {
      endspace = 1;
    }
  }

  if ((endspace != 0) && (rightspace > 0)) {
    datastr = datastr.substring(0, rightspace);
  }
  
  return datastr;
}

function checkemail(name, data, allowednull)
{
  var datastr = data;
  var lefttrim = datastr.search(/\S/gi);
  
  if (lefttrim == -1) {
    if (allowednull) {
      return 1;
    } else {
      alert("" + name + ": please input a valid email");
      return -1;
    }
  }

  datastr = trimall(datastr);

  var myRegExp = /[a-z0-9](([a-z0-9]|[_\-\.]([a-z0-9])*)*)@([a-z0-9]([a-z0-9]|[_\-][a-z0-9])*)((\.[a-z0-9]([a-z0-9]|[_\-][a-z0-9])*)*)/gi;
  var answerind = datastr.search(myRegExp);
  var answerarr = datastr.match(myRegExp);
  
  if (answerind == 0 && answerarr[0].length == datastr.length)
  {
    return 0;
  }
  
  alert("" + name + ": please input a valid email");
  return -1;
}

function checkprice(event){
	if((event.keyCode<48 || event.keyCode>57) && event.keyCode!=46){
		event.returnValue=false;
	}
}


/*for bottom style*/
function changeimg(val,objName){
	//alert(val);
	//alert(objName);
	document.getElementById(objName).src="images/"+val+"_on.png";
		//document.getElementById("left_arrow").src
}

function returnimg(val, objName){
	document.getElementById(objName).src="images/"+val+".png";
}