var state=new Array(4);
state[1]=1;
state[2]=1;
state[3]=1;
state[4]=1;
function minBox(n){
	var data=document.getElementById("data_"+n);
	var min_bt=document.getElementById("min_"+n);
	if(state[n]==1){
		data.style.visibility="hidden";
		data.style.position='absolute';
		min_bt.style.backgroundImage="url(image/normal.jpg)"
		state[n]=0;
	}
	else{
		data.style.visibility="visible";		
		data.style.position='relative';
		min_bt.style.backgroundImage=""
		state[n]=1;
	}
}