var gh_rates = new Object; 
gh_rates['usd']=1.51; 
gh_rates['gbp']=1; 
gh_rates['eur']=1.10; 
gh_rates['aud']=1.65; 
gh_rates['zar']=11.21; 
gh_rates['cad']=1.53; 
gh_rates['chf']=1.60;