function doChange()
{
 var bChecked=document.all.zorder.checked;
 document.all.zprod[0].disabled=!bChecked;
 document.all.zprod[1].disabled=!bChecked;
 document.all.zuser.disabled=!bChecked;
 document.all.zemail.disabled=!bChecked;
 if(bChecked)
 {
  document.all.RegInfo.style.display="";

  document.all.vcdromx.checked=!document.all.zprod[0].checked;
  document.all.copixp.checked=!document.all.zprod[1].checked;

  document.all.vcdromx.disabled=document.all.zprod[0].checked;
  document.all.copixp.disabled=document.all.zprod[1].checked;
 }
 else
 {
  document.all.RegInfo.style.display="none";

  document.all.vcdromx.disabled=false;
  document.all.copixp.disabled=false;
 }
 doCal();
}

function doCal()
{
 var iCost=0;
 if(document.all.vcdromx.checked)iCost=28;
 if(document.all.copixp.checked)iCost+=28;
 if(document.all.zorder.checked)iCost/=2;
 if(iCost==56)iCost=42;
 if(iCost==0)iCost="";
 document.all.COST.innerText=iCost;
 document.all.xcost.innerText=iCost;
}

function doCheck()
{
 if((!document.all.vcdromx.checked)&&(!document.all.copixp.checked))return false;
 return true;
}