function ajaxFunction(rate){
	var ajaxRequest;

	try{
		ajaxRequest = new XMLHttpRequest();
	} catch (e){
		try{
			ajaxRequest = new ActiveXObject("Msxml2.XMLHTTP");
		} catch (e) {
			try{
				ajaxRequest = new ActiveXObject("Microsoft.XMLHTTP");
			} catch (e){
				alert("Your browser broke!");
				return false;
}}}

	ajaxRequest.onreadystatechange = function(){
		if(ajaxRequest.readyState == 4){
			document.getElementById(rate).innerHTML = ajaxRequest.responseText
		}
	}

if (rate=='dollar') {
	var year = document.formdollar.yeardollar.value
	var month = document.formdollar.monthdollar.value
	var day = document.formdollar.daydollar.value
}

if (rate=='yuan') {
	var year = document.formyuan.yearyuan.value
	var month = document.formyuan.monthyuan.value
	var day = document.formyuan.dayyuan.value
}

if (rate=='euro') {
	var year = document.formeuro.yeareuro.value
	var month = document.formeuro.montheuro.value
	var day = document.formeuro.dayeuro.value
}

	ajaxRequest.open("POST", "ajax_rate.php", true);
	ajaxRequest.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
	ajaxRequest.setRequestHeader("Content-length", (year.length+month.length+day.length)*3);
	ajaxRequest.setRequestHeader("Connection", "close");
	ajaxRequest.send('rate=' + rate + '&month=' + month + '&year=' + year + '&day=' + day);
}