function addClass(element,value){
  if (!element.className){
	  element.className = value;
	} else {
	  newClassName = element.className;
		newClassName += " ";
		newClassName += value;
		element.className = newClassName;
	}
}

function stripeTables(){
  if (!document.getElementsByTagName) return false;
		var tables = document.getElementsByTagName("table");
  for (var i=0; i<tables.length; i++){
	  tables[i].style.backgroundColor = "#5e137a";
    var odd = false;
  	var rows = tables[i].getElementsByTagName("tr");
	  for (var j=0; j<rows.length; j++){
	    if (odd == true){
  		  addClass(rows[j],"greenwhite");
	  		odd = false;
		  } else {
		    addClass(rows[j],"whitegreen");
	  		odd = true;
			}
	  }
	}
}
addLoadEvent(stripeTables);