function calc(){
	var mr,dl,ta,w1,w2,w3,w4,w5,l1,l2,l3,l4,l5,a1,a2,a3,a4,a5;
	w1=document.getElementById('w1').value;
	w2=document.getElementById('w2').value;
	w3=document.getElementById('w3').value;
	w4=document.getElementById('w4').value;
	w5=document.getElementById('w5').value;

	l1=document.getElementById('l1').value;
	l2=document.getElementById('l2').value;
	l3=document.getElementById('l3').value;
	l4=document.getElementById('l4').value;
	l5=document.getElementById('l5').value;
	
	if(w1>"" && l1>""){
		a1=w1*l1;
		document.getElementById('a1').value=a1;
	}
	else a1=0;
	if(w2>"" && l2>""){
		a2=w2*l2;
		document.getElementById('a2').value=a2;
	}
	else a2=0;
	if(w3>"" && l3>""){
		a3=w3*l3;
		document.getElementById('a3').value=a3;
	}
	else a3=0;
	if(w4>"" && l4>""){
		a4=w4*l4;
		document.getElementById('a4').value=a4;
	}
	else a4=0;
	if(w5>"" && l5>""){
		a5=w5*l5;
		document.getElementById('a5').value=a5;
	}
	else a5=0;
	
	ta=a1+a2+a3+a4+a5;
	document.getElementById('ta').value=FormatNumberBy3(Math.round(ta*100)/100);
	dl=document.getElementById('dl').value;
	if(dl>""){
		dl=document.getElementById('dl').value;
		mr=ta/27*dl/12;
		//alert(mr);
		document.getElementById('mr').value=FormatNumberBy3(Math.round(mr*100)/100);
	}
	else document.getElementById('mr').value="";
}