function displaycontent(id) {
 if(id != null){
 var d = document.getElementById(id).style.display;
 document.getElementById(id).style.display = (d == "none" || d == "") ? "block" : "none";
 if(document.getElementById(id).style.display == "none"){
 document.getElementById("divopen").style.display = "block";
 }
 }
 }