free javascript : Check and Uncheck

Copy the Below Code and Paste it in HTML in Blogger post anywhere or flow like this > sing in > Design > Layout > Add a gadget > HTML/JavaScript and Paste the code and save it.

<head>

<!-- Begin
var checkflag = "false";
function check(field) {
if (checkflag == "false") {
for (i = 0; i < field.length; i++) {
field[i].checked = true;}

checkflag = "true";
return "Uncheck All"; }
else {
for (i = 0; i < field.length; i++) {
field[i].checked = false; }
checkflag = "false";
return "Check All"; }
}
//  End -->
</script>
</HEAD>

<body>

<center>
<form name=myform action="" method=post>
<table>
<tr><td>
<b>Your Favorite Scripts & Languages</b><br>
<input type=checkbox name=list value="1">facebook<br>
<input type=checkbox name=list value="2">google<br>
<input type=checkbox name=list value="3">yahoo>
<input type=checkbox name=list value="4">HTML<br>
<input type=checkbox name=list value="5">gmail<br>
<br>                                                    
<input type=button value="Check All" onClick="this.value=check(this.form.list)"> 
</td></tr>
</table>
</form>
</center>
<br />
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free javascript

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