[muazzez]

Böyle dene:
olddiv.parentNode.removeChild(olddiv);

 
<script type="text/javascript">
var id = 1;
function Slot(){

var element = document.getElementById('secenek_alan');
var div = document.createElement("div");
div.innerHTML = '<div id="colorfill'+id+'" >katman</div><br />';
element.appendChild(div);
id++;
}

function Slot_Sil(val){
var oldelement = document.getElementById('secenek_alan');
var olddiv = document.getElementById(val);
olddiv.parentNode.removeChild(olddiv);

/*
try{
oldelement.removeChild(olddiv);
}catch(e){
alert(e);
}
*/

}

</script>
<div id="secenek_alan"></div>
<input type="button" value="ekle" onclick="Slot()"><br>
<input type="button" value="sil" onclick="Slot_Sil('colorfill1')">