function upeffect(cur){
	if (document.getElementById)
	cur.className='buttonup' ;
	}

function normaleffect(cur){
	if (document.getElementById)
	cur.className='button' ;
	}
	
function upeffect1(cur){
	if (document.getElementById)
	cur.className='nav1up' ;
	}

function normaleffect1(cur){
	if (document.getElementById)
	cur.className='nav1' ;
	}	
	
function upeffect2(cur){
	if (document.getElementById)
	cur.className='nav2up' ;
	}

function normaleffect2(cur){
	if (document.getElementById)
	cur.className='nav2' ;
	}