function ShowHide(element,elementtohide,elementtohide2,elementtohide3){
var hp = document.getElementById(element);
var hp1 = document.getElementById(elementtohide);
var hp2 = document.getElementById(elementtohide2);
var hp3 = document.getElementById(elementtohide3);
if (hp.style.display=="block"){
hp.style.display = "none";
hp.style.position = "absolute";
}else {

hp1.style.display = "none";
hp2.style.display = "none";
hp3.style.display = "none";
hp1.style.position = "absolute";
hp2.style.position = "absolute";
hp3.style.position = "absolute";
if(hp.id=="graella"){
hp.style.position = "absolute";
hp.style.display ="block";

}else{
hp.style.display = "inherit";
hp.style.position = "relative";
}
}
}