Java EE (Java Enterprise Edition) General Discussion

i have a checkbox generated dynamically in a form .

I need to validate to check whether atleast one check box is clicked .

i can validate when there is more than one checkbox generated . But i cannot if the form contains only one checkbox
Below is the js .

function dothecheck()
{

var checkedvalue=new String();
var checkVal=document.frm.closecase;
var checklength=checkVal.length;
var val=0;
//alert(checklength);
for(var i=0;i<checklength;i++)
{
if(checkVal.checked==true)
{
// alert("checked");
document.frm.submit();
}
else
{
val=val+1;
// alert(val);
}

}
if(val==checklength)
{
// alert(val);
alert("Please check a checkbox");
}
else
{
document.frm.submit();
}

}

Somebody Help at this. plz