var gh_rates = new Object; 
gh_rates['usd']=1.56; 
gh_rates['gbp']=1; 
gh_rates['eur']=1.20; 
gh_rates['aud']=1.73; 
gh_rates['zar']=11.42; 
gh_rates['cad']=1.61; 
gh_rates['chf']=1.65;