function setCurrency(whatCurrency) {
    if(whatCurrency=="euro") {
        document.cookie = "currency=EURO; path=/";
        document.imgEURO.src = "images/euro1.jpg";
        document.imgSTG.src = "images/stg.jpg";
        changecss('.euro','display','block');
        changecss('.stg','display','none');
    } else {
        document.cookie = "currency=STG; path=/";
        document.imgEURO.src = "images/euro.jpg";
        document.imgSTG.src = "images/stg1.jpg";
        changecss('.euro','display','none');
        changecss('.stg','display','block');
    }
}