Puoi fare cosi (con IE comunque)...

codice:
<DIV ID="pluto" STYLE="position:absolute;top:200;left:40;">
   <FORM>
	   <input type="checkbox" name="c1" onClick="show_hide(document.getElementById('T1'))"><INPUT TYPE="text" NAME="T1" SIZE="20">
		 

	   <input type="checkbox" name="c2" onClick="show_hide(document.getElementById('T2'))"><INPUT TYPE="text" NAME="T2" SIZE="20">
   </FORM>
</DIV>

<script language="JavaScript" type="text/javascript">
<!--
var allCheckboxes = document.all.tags("input");
for (i=0;i<allCheckboxes.length;i++) {
 if (allCheckboxes[i].type == "text") {
  hide(allCheckboxes[i]);
 }
}
//-->
</script>