t_speed=5;
		my_cnt=0;
		
	function tenmetu(){
		obj = document.all("t1");
		if(my_cnt==0)
				{
				obj.style.visibility = "visible";
				my_cnt=1;		
				}else{
				obj.style.visibility = "hidden";
				my_cnt=0;
				}
				setTimeout("tenmetu()", t_speed*100);			
				}