function toggleColour(obj,color)
{
   var row = findParentRow(obj);
   row.style.backgroundColor = (row.style.backgroundColor == color) ? "" : color;
}


function findParentRow(obj)
{
   var tmp = obj.parentNode;
   if(tmp.nodeName.toLowerCase() != "tr")
   {
      tmp = findParentRow(tmp);
   }
   return tmp;
}