HTML Element Click is causing Problem

Question

<li id="mx334" ctype="tab" role="presentation">
<a id="mx334_anchor" class="text tablabeloff off" href="javascript: sendEvent('click','mx334','');" onmouseover="return noStatus()" onkeydown="if(event.keyCode==KEYCODE_SPACEBAR){sendEvent('click','mx334','');cancelEvent(event);}else {itemAKey(event,this)}" onblur="removeClass(this,'offhover')" onfocus="appendClass(this,'offhover')" title="Log" tabindex="-1" role="tab">
<img id="mx334_er_img" class="tab_blank_icon" alt="" title="" style="display:none" src="https://152.93.6.100/itservice/webclient/skins/skins-20150213-2055/taa13/images/blank.gif">
Log
</a>
</li>
Need to Click a Button via VB. Below code is working fine.
IE.Document.getElementByid("mx334_anchor").Click()
but the Actual problem is when i maximize or Minimize my internet explorer, I am getting a waring Message " Do u want to leave this page" How can I stop this Message popping UP. This Problem Occurs after click.

Answer 1

Found the below Code in C#, Can Some one convert it to VB.net so that i can check.
Browser.Navigated +=
new WebBrowserNavigatedEventHandler(
(object sender, WebBrowserNavigatedEventArgs args) => {
Action<HtmlDocument> blockAlerts = (HtmlDocument d) => {
HtmlElement h = d.GetElementsByTagName("head")[0];
HtmlElement s = d.CreateElement("script");
IHTMLScriptElement e = (IHTMLScriptElement)s.DomElement;
e.text = "window.alert=function(){};";
h.AppendChild(s);
WebBrowser b = sender as WebBrowser;
blockAlerts(b.Document);
for (int i = 0; i < b.Document.Window.Frames.Count; i++)
try { blockAlerts(b.Document.Window.Frames[i].Document); }
catch (Exception) { };
Note : 1. I am using Internet Explorer not Web browser.
2. When i Click button Via Automation Page doesn't navigate, it Opens in same window.( Pop UP Appears.
3. If i do Manually it works perfectly without an Popup.