'alert' problem!

Hello to all of you.
could anybody tell me why my alert is not  working?
I have this function in an external  javascript file. 
when I call the function in my page the alert does not work.

call:
var fstree = new LiveTree(root,options); 
        fstree.render;


in the external file i have:

LiveTree.render = function () {
     
    var tree = this;
    windows.alert('Welcome to JavaScript');
    document.write(tree.getHtml());
    tree.start();
   
}
I would be really grateful for any help about that.

Regards,
Erick


    

    
        
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Change windows.alert(...); to window.alert(...); or even
just
alert(...);


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