var showndata = "main";
function toggledata(data)
{
if(showndata != data && data == "contact")
{
document.getElementById(showndata).style.display = "none";
document.getElementById(data).style.display = "block";
showndata = data;
}
else if(showndata == data && data == "contact")
{
document.getElementById(showndata).style.display = "none";
document.getElementById("main").style.display = "block";
showndata = "main";
}
else
{
document.getElementById(showndata).style.display = "none";
document.getElementById(data).style.display = "block";
showndata = data;
}
}