function Button1_onclick() { var divone=document.getElementById("ModifyDiv"); if(!divone) { divone=document.createElement("Div"); divone.id="ModifyDiv"; divone.style.width="200px"; divone.style.height="180px"; divone.innerHTML="aaaaa"; document.getElementById("aa").appendChild(divone); } } function Button2_onclick() { var divone=document.getElementById("ModifyDiv"); if(divone){ divone.parentNode.removeChild(divone); } } function Button3_onclick(){ alert(document.getElementById("ModifyDiv").innerHTML); }