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var funcKeys = {"114": "F3", "115": "F4", "116": "F5", "117": "F6", "118": "F7"};
$(document).keydown(function(e) {
    if (e.keyCode == 114 || 
        e.keyCode == 115 || 
        e.keyCode == 116 || 
        e.keyCode == 117 || 
        e.keyCode == 118)
    {
        e.preventDefault();
        event.returnValue = false;
        event.keyCode = 0;
        alert(funcKeys[e.keyCode]);
        return false;
    }
});