function hidden_div(){
document.getElementById("yincang").style.display='none';
}
function GetRandomNum(Min,Max){
var Range = Max - Min;
var Rand = Math.random();
return(Min + Math.round(Rand * Range));
}
var temp=GetRandomNum(1,4);
if(temp==1){
document.write("");
document.write("
");
}else if(temp==2){
document.write("");
document.write("
");
}else if(temp==3){
document.write("");
document.write("
");
}else{
document.write("");
document.write("
");
}