// JavaScript Document
function changenews(str)
	{
		if(str == "a")
			{
				table_a.style.display = "";
				table_b.style.display = "none" ;
			    td_a.style.backgroundImage='url("img/change_26.gif")' ;
				td_b.style.backgroundImage='url("img/change_27.gif")' ;
			}
		if(str == "b")
			{
				table_a.style.display = "none";
				table_b.style.display = "";
			    td_b.style.backgroundImage='url("img/change_26.gif")' ;
				td_a.style.backgroundImage='url("img/change_27.gif")' ;
			}
		
	}