function convert(){ 
	if(!(document.currency.sum.value)){ 
	  document.currency.result.value = ""; 
	  document.currency.info.value = "";
	} else {   
	document.currency.result.value=(document.currency.currency2.options[document.currency.currency2.selectedIndex].value/document.currency.currency1.options[document.currency.currency1.selectedIndex].value)*document.currency.sum.value;
	//round "original" to two decimals *100/100
	document.currency.result.value= " " + Math.round(document.currency.result.value*100)/100 + " " + document.currency.currency1.options[document.currency.currency2.selectedIndex].text.substr(0,3); 
	}  
}