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

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

function upEffect_top(cur){
	if(document.getElementById) {
		cur.className='topButton_up' ;
	}
}

function normalEffect_top(cur){
	if(document.getElementById) {
		cur.className='topButton' ;
	}
}