Array.prototype.in_array = function ( obj ) {
	var len = this.length;
	for ( var x = 0 ; x <= len ; x++ ) {
		if ( this[x] == obj ) return true;
	}
	return false;
}

function makeRequest(url) {
	var http_request = false;

	if (window.XMLHttpRequest) { // Mozilla, Safari,...
		http_request = new XMLHttpRequest();
		if (http_request.overrideMimeType) {
			http_request.overrideMimeType('text/xml');
			// See note below about this line
		}
	} else if (window.ActiveXObject) { // IE
		try {
			http_request = new ActiveXObject("Msxml2.XMLHTTP");
		} catch (e) {
			try {
				http_request = new ActiveXObject("Microsoft.XMLHTTP");
			} catch (e) {}
		}
	}
	
	if (!http_request) {
		return false;
	}
//	http_request.onreadystatechange = function() { alertContents(http_request); };
	http_request.open('GET', url, true);
	http_request.send(null);
}

function plus(costid) {
	a = parseInt(document.getElementById([costid]).value);
	document.getElementById([costid]).value = a + 1;
}
function minus(costid) {
	if(document.getElementById([costid]).value > 1) document.getElementById([costid]).value = document.getElementById([costid]).value - 1;
}
function closemessage() {
	document.getElementById(["message"]).style.display = "none";
}