function lostcena()
{
var valutaval = document.getElementById('voluta1').value;
var cenaval = document.getElementById('cena1').value;
if(valutaval == 1)
 {
var valuta=1;
 }
 else if(valutaval == 2)
 {
var valuta=1.30;
 }
else if(valutaval == 3)
 {
var valuta=0.12;
 }
cenalost=cenaval*valuta;
document.getElementById('cena2').value=Math.abs(cenalost);
}
function hidecena()
{
var cViews = document.getElementById('dogovornaya');
var cViews2 = document.getElementById('dogovornaya2');
var cText = document.getElementById('cText');
if (cViews.style.display == 'none')
{
cViews.style.display='inline';
cViews2.style.display='none';
document.getElementById('cena1').value='';
document.getElementById('cena2').value='';
cText.innerHTML='указать договорную цену';
}
else
{
cViews.style.display='none';
cViews2.style.display='inline';
document.getElementById('cena1').value=1;
document.getElementById('cena2').value=1;
cText.innerHTML='убрать договорную цену';	
}
}