/*ʵÏÖ²ãµÄÇл»2*/
var cur_sheet=1;
function change(num){
if(num!=cur_sheet){
document.getElementById("con"+cur_sheet).style.display="none";
document.getElementById("bg"+cur_sheet).className="nor";
document.getElementById("con"+num).style.display="";
document.getElementById("bg"+num).className="cur";
cur_sheet=num;
}
}