function calc(form) {	 
form.summ.value="";

pLustra=400; 
pTruba=200;
pUgol=200;
pSvetilnik=500;
pRadius=600;


Lustra=form.Lustra.value*pLustra;
Truba=form.Truba.value*pTruba;
Ugol=form.Ugol.value*pUgol;
Svetilnik=form.Svetilnik.value*pSvetilnik;
Radius=form.Radius.value*pRadius;
Ploshad=form.Ploshad.value; 
pPlintus=150;
if (Ploshad<10) {Ploshad=10};
Faktura=form.Faktura.value;  
  switch (Faktura){
	case "Russia": 
		Price=350;
		if (Ploshad>=10&&Ploshad<25){Price=500}
			else if (Ploshad>=25&&Ploshad<35) {Price=450} 
						else if (Ploshad>=35&&Ploshad<70) {Price=400} 
	break;
	case "France": 
		Price=600;
		if (Ploshad>=10&&Ploshad<25){Price=750}
			else if (Ploshad>=25&&Ploshad<35) {Price=700} 
						else if (Ploshad>=35&&Ploshad<70) {Price=630} 
	break;
	case "Descor": 
		Price=700;
		if (Ploshad>=10&&Ploshad<25){Price=800}
			else if (Ploshad>=25&&Ploshad<35) {Price=750} 
						else if (Ploshad>=35&&Ploshad<70) {Price=720}  
	break;
  }
tPlint=form.Plintus.value;
if (tPlint=="Penoplast"){pPlintus=80}; 
Plintus=pPlintus*form.PlintusSize.value;  
mainPrice=(Ploshad*Price)+Lustra+Truba+Ugol+Svetilnik+Radius+Plintus;   
if (mainPrice <7000){mainPrice=7000}         
form.summ.value=mainPrice;
//return mainPrice;
}