function first() {
	changeTab("work1");
}



//表示項目切替え
function changeTab(tabNo) {
	switch (tabNo) {
		case "work0" :
			document.getElementById("work1").style.display = "block";
			document.getElementById("work2").style.display = "block";
			document.getElementById("work3").style.display = "block";
			document.getElementById("work4").style.display = "block";
			document.getElementById("work5").style.display = "block";
			document.getElementById("work6").style.display = "block";
			break;
		case "work1" :
			document.getElementById("work1").style.display = "block";
			document.getElementById("work2").style.display = "none";
			document.getElementById("work3").style.display = "none";
			document.getElementById("work4").style.display = "none";
			document.getElementById("work5").style.display = "none";
			document.getElementById("work6").style.display = "none";
			break;
		case "work2" :
			document.getElementById("work1").style.display = "none";
			document.getElementById("work2").style.display = "block";
			document.getElementById("work3").style.display = "none";
			document.getElementById("work4").style.display = "none";
			document.getElementById("work5").style.display = "none";
			document.getElementById("work6").style.display = "none";
			break;
		case "work3" :
			document.getElementById("work1").style.display = "none";
			document.getElementById("work2").style.display = "none";
			document.getElementById("work3").style.display = "block";
			document.getElementById("work4").style.display = "none";
			document.getElementById("work5").style.display = "none";
			document.getElementById("work6").style.display = "none";
			break;
		case "work4" :
			document.getElementById("work1").style.display = "none";
			document.getElementById("work2").style.display = "none";
			document.getElementById("work3").style.display = "none";
			document.getElementById("work4").style.display = "block";
			document.getElementById("work5").style.display = "none";
			document.getElementById("work6").style.display = "none";
			break;
		case "work5" :
			document.getElementById("work1").style.display = "none";
			document.getElementById("work2").style.display = "none";
			document.getElementById("work3").style.display = "none";
			document.getElementById("work4").style.display = "none";
			document.getElementById("work5").style.display = "block";
			document.getElementById("work6").style.display = "none";
			break;
		case "work6" :
			document.getElementById("work1").style.display = "none";
			document.getElementById("work2").style.display = "none";
			document.getElementById("work3").style.display = "none";
			document.getElementById("work4").style.display = "none";
			document.getElementById("work5").style.display = "none";
			document.getElementById("work6").style.display = "block";
			break;
	}
}