function GeoCalc(){
var Volum;
sidea = eval(document.cylindvol.sidea.value);
sideb = eval(document.cylindvol.sideb.value);


if((sidea > 0) && (sideb > 0)){

	Volum = FormatNumber((Math.PI / 4) * Math.pow(sidea,2) * sideb);
	
	if(Volum >= 10000)
		resultVolum = "&#928; = 3.141592653589793<br />Surface<br />" + Volum + "  cm<sup>2</sup><br />" + FormatNumber(Volum/1000000) + "  m<sup>2</sup><br />";
	else
		resultVolum = "&#928; = 3.141592653589793<br />Surface<br />" + Volum + "  cm<sup>2</sup><br />";
	
	document.getElementById("volume").innerHTML = resultVolum;
}

}