Browser close button conformation alert

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Javascript

Good Morning to all i want to give conformation alert in browser close button click event i am using the following code

window.onbeforeunload = function () {
                return '';
        }

But the above code Give the alert at all button clickevent so i modified the code as follows

window.onbeforeunload = function () {
            if (Browseraction != "search") {
                return '';
            }
        }

i declare variable Browseraction as a global variable in all bages button click event now the problem is solved.It is worked fine in GoogleChrome,Firefox,Ie7,Ie8, but not work in ie6 how can i solve it ie6 please anyone help me




thanks in advance
By
Meganathan M