Funcion cuando se presiona una tecla

//Function for javaScript

//Function for key pressed
//This is to the enter key, but can be changed to another

function tecla(e)
{
var keyCode;
if(window.event)
{
keyCode=window.event.keyCode;
}
else if(e)
{
keyCode=e.which;
}
// Here are the key changes
if (keyCode==13)
{
//Function to perform
}
}


By GDiaz.