Find the key code using javascript

<input type="text" id="txtSearch"  önkeypress="searchKeyPress(event);" />

function searchKeyPress(e)         
    {
        // look for window.event in case event isn't passed in
        if (window.event) { e = window.event; }
        if (e.keyCode == 13) {
           alert('Enter key pressed on the Text Box control'); 
        }         
    }