function premier(n) {

	for(var i = 1; i < 3; i++) {
	    obj = document.getElementById("premier"+i);
	    img = document.getElementById("premier_button"+i);
	    if ( n == i ) {
	        obj.style.display = "block";
	   		img.height = 26;
	        img.src = "http://www.hagongda.net/cn/ycjy/images/news"+i+"_a.gif";    
	    } else {
	        obj.style.display = "none";
	   		img.height = 26;
	        img.src = "http://www.hagongda.net/cn/ycjy/images/news"+i+"_b.gif";
	    }
	}

}