// JavaScript Document
flag = 0;


function expand(){
	if(!flag){
		document.getElementById('acid_img').style.display = 'none';
		document.getElementById('imgover_acid').style.display = 'block';
		flag = 1;
	}
}

function contract(){
	if(flag){
		document.getElementById('imgover_acid').style.display = 'none';
		document.getElementById('acid_img').style.display = 'block';
		flag = 0;
	}
}