<input type=checkbox onclick=selectall()>Select all<br>
<input type=checkbox name=a1>
<input type=checkbox name=a1>
<input type=checkbox name=a1>
<input type=checkbox name=a1>
<script>
function selectall(){
var obj=document.all.a1
for(i=0;i<obj.length;i++)
obj[i].checked=(event.srcElement.checked)?true:false
}
</script>
<input type=checkbox name=a1>
<input type=checkbox name=a1>
<input type=checkbox name=a1>
<input type=checkbox name=a1>
<script>
function selectall(){
var obj=document.all.a1
for(i=0;i<obj.length;i++)
obj[i].checked=(event.srcElement.checked)?true:false
}
</script>
<input type=checkbox name=a1>
<input type=checkbox name=a1>
<input type=checkbox name=a1>
<input type=checkbox name=a1>
<script>
function selectall(){
var obj=document.getElementsByTagName("input")
for(i=0;i<obj.length;i++)if(obj[i].type=="checkbox")
obj[i].checked=window.event.srcElement.checked
}
</script>
......
<script language="JavaScript">
<!--
function CheckAll(form)
{
for (var i=0;i<form.elements.length;i++)
{
var e = form.elements[i];
if (e.name != 'chkall')
e.checked = form.chkall.checked;
}
}
//-->
</script>
function checkall(form){
for(i=0;i<form.elements.length;i++){
var e=form.elements[i];
e.checked=true;
}
}
</script>