Checkbox validation

[dinu]

Checkbox Validation
I have few checkboxes and if some one selects any of the two check boxes and try to select third checkbox, 1st selected checkbox have to unselect and second and third checkbox have to select. If someone will select 4th checkbox last selected check and previous selected check box to select and first selected checkboxes have to unselect. I'm trying to implement in javascript.
Including my code below,

<FORM NAME="dirr">
<b>Pick Only Two Please!</b>

<INPUT TYPE="checkbox" NAME="d[]" id="d1" onClick="get()"> one

<INPUT TYPE="checkbox" NAME="d[]" id="d2" onClick="get()"> two

<INPUT TYPE="checkbox" NAME="d[]" id="d3" onClick="get()"> three

<INPUT TYPE="checkbox" NAME="d[]" id="d4" onClick="get()"> four

<INPUT TYPE="checkbox" NAME="d[]" id="d5" onClick="get()"> five

</FORM>

<SCRIPT LANGUAGE="javascript">

function get()
{
var divEls = document.getElementsByTagName("input");

var i = 0;
var NewCount=0;
for(i=0;i<divEls.length;i++)
{
if (divEls[i].type == "checkbox"){
if (divEls[i].checked){
NewCount = NewCount + 1
if (NewCount == 3)
{
divEls[i].checked=false;
}
}
}
}
}
</script>
</SCRIPT>

Please let me know, if it is not clear.

[ug4jee]

Check the below sample code:

<SCRIPT LANGUAGE="javascript">
 var lastElement = 0;
  retArr = new Array();
 
 function selectOnlyTwo(buttonGroup) {
if(buttonGroup.checked){ //alert('CHKD'+retArr);
   retArr[retArr.length] = buttonGroup.id;
	if(retArr.length>=3){
		var na = document.getElementById(retArr[0]);
		retArr.splice(0,1);
		na.checked=false;
		//return false;
	}
	}else{ //alert('ELSE'+retArr);
		for(i=0;i<retArr.length;i++){
			if(retArr[i]==buttonGroup.id){
				retArr.splice(i,1);
			}		
		}
	}
 }  //return retArr;
 
 
 //http://www.htmlgoodies.com/tutorials/forms/article.php/3479181/Checkboxes-Only-Two.htm?comment=38873-0
</script>
 
 
<FORM NAME="joe">
<b>Pick Only Two Please!</b>
<INPUT TYPE="checkbox" NAME="d0" id="d0"onclick="selectOnlyTwo(this)" > Hampster
<INPUT TYPE="checkbox" NAME="d1" id="d1" onclick="selectOnlyTwo(this)"> Dog
<INPUT TYPE="checkbox" NAME="d2" id="d2" onclick="selectOnlyTwo(this)"> Cat
<INPUT TYPE="checkbox" NAME="d3" id="d3" onclick="selectOnlyTwo(this)"> Pig
<INPUT TYPE="checkbox" NAME="d4" id="d4" onclick="selectOnlyTwo(this)"> Ferret
<INPUT TYPE="checkbox" NAME="d5" id="d5"onclick="selectOnlyTwo(this)"> Hampster
 <INPUT TYPE="checkbox" NAME="d6" id="d6"onclick="selectOnlyTwo(this)"> Hampster
<INPUT TYPE="checkbox" NAME="d7" id="d7"onclick="selectOnlyTwo(this)"> Hampster
<INPUT TYPE="checkbox" NAME="d8" id="d8"onclick="selectOnlyTwo(this)"> Hampster
 </FORM>

Thanks,