function PhysikCalc(){
var Result;
vala = eval(document.weidthcal.vala.value);
valb = eval(document.weidthcal.valb.value);

if((vala > 0) && (valb > 0)){

	Result = FormatNumber((vala * 1000 / 3600) * valb);
	
	document.getElementById("result").innerHTML = "Résultat<br>" + Result + " m<br />" + FormatNumber(Result / 1000) + " Km";
}

}