function checked_box()
{

document.f.geo.checked=true;
document.getElementById("klavsp").className = "klavblack";

}
function unchecked_box()
{

document.f.geo.checked=false;
document.getElementById("klavsp").className = "klavgray";
}

function tocheck()
{
	
if (document.f.geo.checked==true) unchecked_box(); else checked_box();
}