function ddmc(x){
var arr=new Array('A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z',':','@','.','a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z','1','2','3','4','5','6','7','8','9','0');
var tmp;
var y='';
for (var a=0; a<x.length; a++)
{
tmp=x.substring(a,a+1);
if (tmp=='0') tmp='A';
else
{
for (b=0; b<65; b++)
{
if (arr[b]==tmp)
{
tmp=arr[b+1];
break;
}
}
}
y=y+tmp;
}
return y;
}