function show_print()
{
  document.write ('\074a href=\"javascript:print();\"\076tisk\074/a\076');
}

function spocitejForm()
{
	var x1=0;
	var x2=0;
	var x3=0;
	var x4=0;
	var y1=0;
	var y2=0;
	var y3=0;
	var y4=0;

  var a1=document.formKalk.a1.value;
	var a2=document.formKalk.a2.value;
	var a3=document.formKalk.a3.value;
	var a4=document.formKalk.a4.value;
	
	var b1=document.formKalk.b1.value;
	var b2=document.formKalk.b2.value;
	var b3=document.formKalk.b3.value;
	var b4=document.formKalk.b4.value;
	
	var c1=document.formKalk.c1.value;
	
	var rok=0;
	
	a1=a1.replace(",",".");
	a2=a2.replace(",",".");
	a3=a3.replace(",",".");
	a4=a4.replace(",",".");
	
	b1=b1.replace(",",".");
	b2=b2.replace(",",".");
	b3=b3.replace(",",".");
	b4=b4.replace(",",".");
	
	c1=c1.replace(",",".");
	
	x1=c1/100*a1*b1;
	x2=c1/100*a2*b2;
	x3=c1/100*a3*b3;
	x4=c1/100*a4*b4;
	
	y1=x1-x3;
	y2=x2-x3;
	y3=0;
	y4=x4-x3;
	
	rok=25000/y1;
	
	//zaokrouhleni
  x1=Math.round(1000*x1)/1000;
  x2=Math.round(1000*x2)/1000;
  x3=Math.round(1000*x3)/1000;
  x4=Math.round(1000*x4)/1000;
  
  y1=Math.round(1000*y1)/1000;
  y2=Math.round(1000*y2)/1000;
  y3=Math.round(1000*y3)/1000;
  y4=Math.round(1000*y4)/1000;
  
  rok=Math.round(1000*rok)/1000;
	
	document.formKalk.x1.value=x1;
	document.formKalk.x2.value=x2;
	document.formKalk.x3.value=x3;
	document.formKalk.x4.value=x4;
	
	document.formKalk.y1.value=y1;
	document.formKalk.y2.value=y2;
	//document.formKalk.y3.value=y3;
	document.formKalk.y4.value=y4;
	
	document.formKalk.rok.value=rok;
}