javascript: split & array

function ReturnDivClientID(optionValue,Hidden1ID)
{
  var DivIdString = document.getElementById(Hidden1ID.id).value;
  var myArray= DivIdString.split(';')
  for(var i=0;i<myArray.length;i++)
  {
    var divItem = myArray[i];
    var position = divItem.indexOf('panel'+optionValue);
    if(position !=-1)
    {
        return myArray[i];
    }
  }
  return '';
}