[destus]

<script>
   		window.onload = function(){
			
			var e = document.getElementById('Rock');
			
			var arr = new Array(1,3,5,6);
			
			for (var i = 0; i < arr.length; i++)
			{
				var option = document.createElement('option');
				option.innerHTML = arr[i];
				e.appendChild(option);	
			}
				
		}
   </script>

<select id="Rock"
</select>