function showContent(num)
{
for(var i=0;i<right.children.length;i++)
{
right.children(i).style.display="none";
}
right.children(num).style.display="";
}
function change(content){
if (document.getElementById(content).style.display=="block") {
document.getElementById(content).style.display="none"; 
}
else{ 
document.getElementById(content).style.display="block"; 
}
}