function GeoCalc(){
var Surface;
side = eval(document.squadiag.side.value);

if(side > 0){

	Surface = FormatNumber(Math.sqrt(2) * side);
	
	document.getElementById("surface").innerHTML = "Diagonale<br />" + Surface + "  cm<br />" + FormatNumber(Surface/100) + "  m";
}

}