Unexpected page refresh after callback function

Does anyone have any idea why the following callback doesn't execute the code within? I have a window.onload script (the only one) in my main .html page which is called, for some reason, immediately after the fadeTo.

$("#newentryform").fadeTo("fast", .25, function () {
    var newentry = prompt("Please enter a new item:", "");
    if ((newentry != null) && (newentry != "")) {
        var verify = confirm("Press 'OK' to confirm you wish to create a new entry:" + "\n" + newentry);
        if (verify == true) {
            processnewentry(newentry, dropid);
        }
    }
});

The above function is called from an onclick event in the main .HTML page.

EDIT--code requested in comments

This is the HTML around the button and onclick in question. The call is to the makenewitem function which is the functio开发者_开发问答n above.

<div id="entryinput">
<p>Item<input type="text" id="createitem" readonly /><button  id="createitembutton"onClick="showbuttons(this.id)">Select...</button><button id="createnewitembutton" onClick="makenewitem(this.id)">+ New</button><button id="itemReset" onClick="resetbuttons(this.id)">Reset</button>
<input type="text" id="createitemval" style="display:none" readonly/>
<input type="text" id="createitemindex" style="display:none" readonly/>
</p>
</div>

This is the processnewentry function:

function processnewentry (newentryvalue, dropid) {

if (dropid=="createnewitembutton")
{
    dropid="createitem";
}

    else
{
          dropid="olditem";
}

var createnewItm=document.getElementById(dropid);
    createnewItm.value=newitemvalue;
var createnewitemval=document.getElementById(dropid+"val");
    createnewitemval.value="";
var createnewitemindex=document.getElementById(dropid+"index");
    createnewitemindex.value="1";


        $("#newitemform").fadeTo("fast", 1);

        var currentPage="newitembuttonpressed";
        toggleStatus(currentPage);  //disable inputs and buttons in form


    var hidebutton=document.getElementById(dropid+"button").style.display="none";
    var subdropid=dropid.substr(6);
    var hidenewbutton=document.getElementById("createnew"+subdropid+"button").style.display="none";
    var displaycreateinput=document.getElementById(dropid).style.display="inline";

}

If your onclick is placed on a submit button or an a tag, that might have something to do with it.

You should add return false to your button onclick calls, like this:

<button [...] onClick="showbuttons(this.id); return false;" />

This prevents the default button action (which is submit) to occur.

You could try return false; at the end of you method.