How to deselect the more selected options from combobox?

[Rajesh Gite]

I have a combobox, in that i have taken list of districts so i have provide a facility to select max 5 districts. If user by mistake select more than that i have to give an alert and when user click on ok of the alert msg the the more select option have to deselect. How to do that i am tring on code. see below

function validateListBox()
{
//debugger;
selectedArray=[];
  var selObj = document.getElementById('type1');
  var i;
  var count = 0;
  var no = 0;
  for (i=0; i<selObj.options.length; i++) {
    if (selObj.options[i].selected)
	{
      statelist = selObj.options[i].text;
	  count++;
	  selectedArray.push(statelist);

	  }
	  if(count > 4)
	  {
		//debugger;
		alert("Select four "+type+" at a time only.");

		if(i==selObj.options.length-1)
		{
			for (i=selObj.options.length-1; i>0; i--) 
			{
				if (selObj.options[i].selected)
				{	
					no++;
					if(no>4)
					{
						selObj.options[i].selected=false;
						return false;
					}
				}
			}
		}
		else
		{
		selObj.options[i].selected=false;
		return false;
		}
	  }

[Dormilich]

it doesn’t look wrong at first glance. what part of your code is not working?