// this function is needed to work around 
  // a bug in IE related to element attributes
  function hasClass(obj) {
	 var result = false;
     if (obj.getAttributeNode("class") != null) {
         result = obj.getAttributeNode("class").value;
     }
     return result;
  }   
 /*
  * stripe table colours
  */
 function stripe(id) {
    // the flag we'll use to keep track of 
    // whether the current row is odd or even
    var appliedColour = false;
	var even = false;
  
    // if arguments are provided to specify the colours
    // of the even & odd rows, then use the them;
    // otherwise use the following defaults:
    var evenColor = arguments[1] ? arguments[1] : "#fff";
    var oddColor = arguments[2] ? arguments[2] : "#efefef";
  
    // obtain a reference to the desired table
    // if no such table exists, abort
    var table = document.getElementById(id);
    if (! table) { return; }
    
    // by definition, tables can have more than one tbody
    // element, so we'll have to get the list of child
    // <tbody>s 
    var tbodies = table.getElementsByTagName("tbody");

    // and iterate through them...
    for (var h = 0; h < tbodies.length; h++) {
    
     // find all the &lt;tr&gt; elements... 
      var trs = tbodies[h].getElementsByTagName("tr");
      
      // ... and iterate through them
      for (var i = 0; i < trs.length; i++) {

        // avoid rows that have a class attribute
        // or backgroundColor style
        if (! hasClass(trs[i]) &&
            ! trs[i].style.backgroundColor) {
 		  
          // get all the cells in this row...
          var tds = trs[i].getElementsByTagName("td");
        
          // and iterate through them...
          for (var j = 0; j < tds.length; j++) {
        
            var mytd = tds[j];

            // avoid cells that have a class attribute
            // or backgroundColor style
            if (! hasClass(mytd) &&
                ! mytd.style.backgroundColor &&
                mytd.style.display != 'none') {
        
              mytd.style.backgroundColor =
                even ? evenColor : oddColor;
				
				appliedColour = true;
            }
          }
        }
        // flip from odd to even, or vice-versa
        if (appliedColour) 
		{
			even =  ! even;
			appliedColour = false;
		}
      }
    }
  }
  

/*
 * select a select box option by value
 */
function set_value_selected(select_id, value)
{
	sel = $(select_id);
	for(var i = 0; i < sel.options.length; i++)
	{
		opt = sel.options[i];
		if (opt.value == value)
		{
			sel.selectedIndex = i;
			return;
		}
	}
}