function upEffect(cur){
	if(document.getElementById) {
		cur.className='button_up' ;
	}
}

function normalEffect(cur){
	if(document.getElementById) {
		cur.className='button' ;
	}
}

function upEffect2(cur){
	if(document.getElementById) {
		cur.className='button_up2' ;
	}
}

function normalEffect2(cur){
	if(document.getElementById) {
		cur.className='button2' ;
	}
}