Compatible with IE and Firefox to get KeyboardEvent objects

<input type= "text" name= "words" id= "Search_txt" class= "seachiput fl" placeholder= "input problem, quickly find the answer" onkeydown= "Search ( Event) "/>

function Search (evt) {
EVT = (evt)? EVT: ((window.event)? Window.event: "")//compatible with IE and Firefox to get KeyboardEvent objects
var key = Evt.keycode? Evt.keyCode:evt.which; Compatible with IE and Firefox to get key values for KeyboardEvent objects
if (key = = 13) {//Enter
Helpsearch (); JS method for searching
}
};

Compatible with IE and Firefox to get KeyboardEvent objects