function get_fuel(distance,fuel){
	var v_from=document.form.from.selectedIndex;
	var v_to=document.form.to.selectedIndex;
	switch (v_from){
		case 0: kmtolitri(distance,fuel);break;
		case 1: if(document.form.to.selectedIndex==0)mtolitri(distance,fuel);else mtog(distance,fuel); break;
		
	}
	
}

function kmtolitri(distance,fuel){
	var d,f;
	if(document.getElementById("distance").value!='') d=parseFloat(document.getElementById("distance").value); else d=0;
	if(document.getElementById("fuel").value!='') f=parseFloat(document.getElementById("fuel").value); else f=0;
	var kpl = Math.round(100*d/f)/100;
	var mlspg = Math.round(d*454.61/(f*1.6093))/100;
	var mlspgus = Math.round(d*378.54/(f*1.6093))/100;
	var lpck = Math.round((f*100/d)*100)/100;	
	
	var text_result="<p class='title_p relative'>Резултати<a class=\'submit_a x_pos\' onclick=\'hide_result();\' href=\'javascript:hide_result();\'>X</a></p><p><strong>Литри за 100 км: "+lpck+"</strong></p><p>Километри за 1 литър: "+kpl+"</p><p>Мили за 1 империал галон: "+mlspg+"</p><p>Мили за 1 US галон: "+mlspgus+"</p>";	
	//alert("here: "+text_result);
	document.getElementById("result").style.display="block";	 
 	document.getElementById("result").innerHTML = text_result;
}

function mtolitri(distance,fuel){
	var d,f;
	if(document.getElementById("distance").value!='') d=parseFloat(document.getElementById("distance").value); else d=0;
	if(document.getElementById("fuel").value!='') f=parseFloat(document.getElementById("fuel").value); else f=0;
	var mlspg = Math.round((454.61*d)/f)/100;
	var mlspgus = Math.round((378.54*d)/f)/100;
	var lpck = Math.round((f*100/(d*1.6093))*100)/100;
	var kpl = Math.round((d*1.6093/f)*100)/100;
	
	var text_result="<p class='title_p relative'>Резултати<a class=\'submit_a x_pos\' onclick=\'hide_result();\' href=\'javascript:hide_result();\'>X</a></p><p>Километри за 1 литър: "+kpl+"</p><p>Литри за 100 км: "+lpck+"</p><p>Мили за 1 империал галон: "+mlspg+"</p><p>Мили за 1 US галон: "+mlspgus+"</p>";	
	document.getElementById("result").style.display="block";	 
 	document.getElementById("result").innerHTML = text_result;

}

function mtog(distance,fuel){
	var d,f;
	if(document.getElementById("distance").value!='') d=parseFloat(document.getElementById("distance").value); else d=0;
	if(document.getElementById("fuel").value!='') f=parseFloat(document.getElementById("fuel").value); else f=0;
	var mlspgus = Math.round((100*d)/f)/100;
	var mlspg = Math.round((120.09*d)/f)/100;
	var lpck = Math.round(((3.7854*f)*100/(d*1.6093))*100)/100;
	var kpl = Math.round((d*1.6093/(3.7854*f))*100)/100;
	
	var text_result="<p class='title_p relative'>Резултати<a class=\'submit_a x_pos\' onclick=\'hide_result();\' href=\'javascript:hide_result();\'>X</a></p><p>Километри за 1 литър: "+kpl+"</p><p>Литри за 100 км: "+lpck+"</p><p>Мили за 1 империал галон: "+mlspg+"</p><p>Мили за 1 US галон: "+mlspgus+"</p>";	
	document.getElementById("result").style.display="block";	 
 	document.getElementById("result").innerHTML = text_result;
}

function hide_result(){
 	if(document.getElementById("result")){
 	document.getElementById("result").style.display="none";	 
 	document.getElementById("result").innerHTML = "";
 	}
 	
 }