var gh_rates = new Object; 
gh_rates['usd']=1.54; 
gh_rates['gbp']=1; 
gh_rates['eur']=1.20; 
gh_rates['aud']=1.70; 
gh_rates['zar']=11.13; 
gh_rates['cad']=1.63; 
gh_rates['chf']=1.56;