function dens(){densc=document.forms[0].m1.value/document.forms[0].v1.value}
function mass(){massc=document.forms[0].d1.value*document.forms[0].v1.value}
function vol(){volc=document.forms[0].m1.value/document.forms[0].d1.value}
function shodens(){
dens();
document.forms[0].d1.value=densc}
function shomass(){
mass();
document.forms[0].m1.value=massc}

function shovol(){
vol();
document.forms[0].v1.value=volc}
function dc(x){return x*1000}
function d(x){return x/1000}
function mcd(x){return x/1000}
function md(x){return x*1000}
function vc(x){return x/1000000}
function v(x){return x*1000000}