num = 5; // トータル
nme = "../images/voice01/" // 
exp = "jpg" // 拡張子
count = 0;


function numText(){
	if (document.getElementById) {
			document.getElementById("numText").innerHTML = "（"+(count+1)+"/"+num+"）";
			document.getElementById("numText2").innerHTML = "（"+(count+1)+"/"+num+"）";
	}
}

function next() {
	if(count==(num-1)){
		count=0;
		count %= num;
		document.img.src = nme + count + "." + exp;
	}else{
		count +=1;
		count %= num;
		document.img.src = nme + count + "." + exp;
	}
	
	numText();

}

function prev() {
	if(count==0){
		count=(num-1);
		count %= num;
		document.img.src = nme + count + "." + exp;
	}else{
		count -=1;
		count %= num;
		document.img.src = nme + count + "." + exp;
	}
	
	numText();

}