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

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

	Volum = FormatNumber((Math.PI / 3) * Math.pow(sideb,2) * ((3 * (sidea / 2)) - sideb));
	if(Volum >= 0.01){
		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;
	}
	else
		document.getElementById("volume").innerHTML = '';
}

}