function homeTAb(id) {
		if (id==1) {
			document.getElementById("home_t1").className="";
			document.getElementById("home_t2").className="ppt";
			document.getElementById("home_t3").className="ppt";
			document.getElementById("home1").style.display="block";
			document.getElementById("home2").style.display="none";
			document.getElementById("home3").style.display="none";
		}
		if (id==2) {
			document.getElementById("home_t1").className="ppt2";
			document.getElementById("home_t2").className="";
			document.getElementById("home_t3").className="ppt";
			document.getElementById("home1").style.display="none";
			document.getElementById("home2").style.display="block";
			document.getElementById("home3").style.display="none";
		}
		if (id==3) {
			document.getElementById("home_t1").className="ppt2";
			document.getElementById("home_t2").className="ppt";
			document.getElementById("home_t3").className="";
			document.getElementById("home1").style.display="none";
			document.getElementById("home2").style.display="none";
			document.getElementById("home3").style.display="block";
		}
	}