function delCon(){
document.getElementById('diethidtory2').style.display="none";
document.getElementById('diethidtory3').style.display="none";
}



function chgCon(num) {

if(num==1){
document.getElementById('diethidtory1').style.display="";
document.getElementById('diethidtory2').style.display="none";
document.getElementById('diethidtory3').style.display="none";
}else if(num==2){
document.getElementById('diethidtory1').style.display="none";
document.getElementById('diethidtory2').style.display="";
document.getElementById('diethidtory3').style.display="none";
}else if(num==3){
document.getElementById('diethidtory1').style.display="none";
document.getElementById('diethidtory2').style.display="none";
document.getElementById('diethidtory3').style.display="";
}
}