function get_radio_value(name){
var elements=new Array();
elements=document.getElementsByName(name);
for(var i=0;i<elements.length;i++){
if(elements[i].checked){
return elements[i].value;
}
}
}
function convertAmount(){
var src,des,src_am,des_am;
src=get_radio_value("source");
des=get_radio_value("destination");
var src_am_element=document.getElementsByName("source_amount")[0];
src_am=Number(src_am_element.value);
des_am=Math.round(1000000*((src_am*q[src])/q[des]))/1000000;
var des_am_element=document.getElementsByName("destination_amount")[0];
des_am_element.value=des_am;
return false;
}