function  OnBuy(){
document.form_curr.count.style.width="1px";
document.form_curr.count.style.visibility="hidden";
document.form_curr.need_count.value=document.form_curr.count.value;
document.form_curr.need_count.style.width="50px";
document.form_curr.need_count.style.visibility="visible";
}
function  OnSell(){
document.form_curr.need_count.style.width="1px";
document.form_curr.need_count.style.visibility="hidden";
document.form_curr.count.value=document.form_curr.need_count.value;
document.form_curr.count.style.width="50px";
document.form_curr.count.style.visibility="visible";
}