点击全选所有复选框

网页特效

<SCRIPT LANGUAGE="JavaScript">
<!-- 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>
<form name=myform action="" method=post>
<table width="133">
<tr><td width="125">
<b>软件系数调查：<br>
</b>&nbsp;<br>
<input type=checkbox name=list value="1">软件的界面<br>
<input type=checkbox name=list value="2">特效很多<br>
<input type=checkbox name=list value="3">分类详细<br>
<input type=checkbox name=list value="4">完全免费<br>
<input type=checkbox name=list value="5">特效很实用<br>
<input type=checkbox name=list value="6">更新速度快<br>
<br>                                                    
<input type=button value=" 全部选定 " onClick="this.value=check(this.form.list)"> 
</td></tr>
</table>
</form>