Where to use ExecuteOrDelayuntilScriptLoaded(deleteUser, "sp.js"); in this

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SharePoint2010

var objContext = null;
var objWeb = null
var objList = null;
var objItem = null;

function deleteUser() {

var tid = document.getElementById('tid').value;
alert(tid);

objContext = new SP.ClientContext.get_current();
objWeb = objContext.get_web();
objList = objWeb.get_lists().getByTitle("PeopleProfile");

var query = new SP.CamlQuery();
query.set_viewXml('<view><query><where><eq><fieldref name="LinkTitle">' +
'<value type="Text">' + tid + '');

this.collListItems = objList.getItems(query);
objContext.load(collListItems);

objContext.executeQueryAsync(Function.createDelegate(this, this.onSuccess), Function.createDelegate(this, this.onFail));
}

function onSuccess(sender, args) {

var listItemEnumerator = this.collListItems.getEnumerator();
while(listItemEnumerator.moveNext()) {
var oListItem = listItemEnumerator.get_current();
var iid = oListItem.get_id();
alert(iid);
delet(iid);
}
}
function delet(d){

this.lstObjectItem = objList.getItemById(d);
alert(d);
this.lstObjectItem.deleteObject();
// clientContext.load(this.lstObjectItem);
objContext.executeQueryAsync(Function.createDelegate(this, this.onSuccessDel), Function.createDelegate(this, this.onFailDel));
}
function onSuccessDel(sender, args) {
alert('Item deleted');
}

function onFailDel(sender, args) {
alert('Some error occured.');
}

function onFail(sender, args) {
alert('Some error has occured.');

}

when i am executing this code sometime item is deleted some time not