Checkall or Invert Checkboxes

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This will select all – or invert the selected checkboxes.

Body Code:

<script>


function set(n) 
{
               temp = document.main.elements.length  ;
                 
               for (i=0; i < temp; i++)
	{   document.main.elements[i].checked=n;
	   }
} 

function Invers(){

temp = document.main.elements.length ;
                 
for (i=0; i < temp; i++){

          if(document.main.elements[i].checked == 1){document.main.elements[i].checked = 0;}
                else {document.main.elements[i].checked = 1}
               
              }

}
</script>

<FORM  method=post name=main>
<INPUT name=chbox type=checkbox value=1>
<INPUT name=chbox type=checkbox value=2>
<INPUT name=chbox type=checkbox value=3>
<INPUT name=chbox type=checkbox value=4>
<INPUT name=chbox type=checkbox value=5>
<INPUT name=button onclick=set(1) type=button value="Select All"> 
<INPUT name=button onclick=Invers() type=button value=" Invert "> 
<INPUT name=button onclick=set(0) type=button value=" Reset "> 
</form>

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