function addLoadEvent(func) {
  var oldonload = window.onload;
  if (typeof window.onload != 'function') {
    window.onload = func;
  } else {
    window.onload = function() {
      oldonload();
      func();
    }
  }
}
function addClass(element,value) {
  if (!element.className) {
    element.className = value;
  } else {
    newClassName = element.className;
    newClassName+= " ";
    newClassName+= value;
    element.className = newClassName;
  }
}


function highlightRows() {
  if(!document.getElementsByTagName) return false;
  var tbodies = document.getElementsByTagName("tbody");
  for (var j=0; j<tbodies.length; j++) {
     var rows = tbodies[j].getElementsByTagName("tr");
     for (var i=0; i<rows.length; i++) {
           rows[i].oldClassName = rows[i].className
           rows[i].onmouseover = function() {
              if( this.className.indexOf("selected") == -1)
                 addClass(this,"highlight");
           }
           rows[i].onmouseout = function() {
              if( this.className.indexOf("selected") == -1)
                 this.className = this.oldClassName
           }
     }
  }
}


function lockRow() {
	var tbodies = document.getElementsByTagName("tbody");
	for (var j=0; j<tbodies.length; j++) {
		var rows = tbodies[j].getElementsByTagName("tr");
		for (var i=0; i<rows.length; i++) {
			rows[i].oldClassName = rows[i].className
			rows[i].onclick = function() {
				if (this.className.indexOf("selected") != -1) {
					this.className = this.oldClassName;
				} else {
					addClass(this,"selected");
				}
			}
		}
	}
}
addLoadEvent(highlightRows);
addLoadEvent(lockRow);