Code issue into jquery ?

Question

window.onunload = function () {

if ((window.event.clientX < 0) || (window.event.clientY < 0)) // close button

{

var Data = $("#transactionID").val();

removeSoftbooking(Data);

alert("CLose browser");

}

else if (window.event.altKey == true) // ALT + F4

{

var Data = $("#transactionID").val();

removeSoftbooking(Data);

alert("Tab Close");

}

else // for all other unload events

{

var Data = $("#transactionID").val();

removeSoftbooking(Data);

}

Not Run Code Google chrome ,FF, Safari . 

Please please my help