how to fire an event in html on select index change

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ASP.NET

HTML

Hi all,

Here is my problem i am creating html controls dynamically so now i try to add events to my control can any one help me ..

here the sample code..

var cellfour = row.insertCell(3);
  var el = document.createElement('select');
   el.name = 'select' + iteration;
  el.id = 'select' + iteration;

//here i like to add onchange event but it wont works 

 el.onchange=" return alert('hi')";
  cellfour.appendChild(el);

 arr=["Input","Select","CheckBox","Radio"];
  for ( i=0;i<arr.length;i++)
  {
  var opt1=document.createElement('option');
  opt1.text=arr[i];
  el.options.add(opt1);

Thanks in Advance..

Seshu