function yulan(str){
	var pic = document.getElementById('pic');
	pic.innerHTML='';
	var imgYulan = document.createElement("img");
    imgYulan.src = str;
    imgYulan.style.marginLeft = "15px";
    imgYulan.style.weith = "120px";
    imgYulan.style.height = "80px";
    pic.appendChild(imgYulan);
}