function calcld(){
    var form = document.form1;
   
    var f = form.factor.value;
    
    var l = form.length.value;
	
	var d = form.diameter.value;
	
	var Precision=6;
	
	
	var r1 = l / d;
	var result = f * r1;
	


     form.result.value =result.toPrecision(Precision);
    
 return true;
}