Prevent key for input - useful for keypress event; function based

preventkey.js

function preventKey(){
	var shift=[].shift,e=window.event;
	if(isNaN(+arguments[0])) e=shift.call(arguments)||e;
	for(var i=0,len=arguments.length;i<len;i++){if((e.which||e.keyCode)==arguments[i]) return false;}
}