access html elements in internet explorer

[tlacaelelrl]

I have a problem and don´t know how to fix it, I have this code

var apply=document.getElementById("regulartextfields");				
var counterrors=0;
if (apply.addEventListener)
{
apply.addEventListener("change", checkfield_1, false);
}
else if (apply.attachEvent)
{
apply.attachEvent("onchange", checkfield_1);
}

which works perfectly fine in both internet explorer and firefox for the following case

<input type="text" size="15" id="regulartextfields">

But only works in firefox in this case

<div id="regulartextfields">
<input type="text" size="15"/>
<input type="text" size="15"/>
<input type="text" size="15"/>
<input type="text" size="15"/>
</div>

In the last one firefox will attach an event to each field but it will stop working completely in IE, can someone tell me how I should go about attaching an event to multiple elements in IE?