// XMLHttpRequest 오브젝트 생성 함수
// @sample oj = createHttpRequest();
// @return XMLHttpRequest 오브젝트
function createHttpRequest()
{
    if (window.ActiveXObject) {
        try {
            // IE6, IE7
            return new ActiveXObject("Msxml2.XMLHTTP");
        } catch (e) {
            try {
                // IE4, IE5
                return new ActiveXObject("Microsoft.XMLHTTP");
            } catch (e2) {
                return null;
            }
        } 
    } else if (window.XMLHttpRequest) {
        // Mozilla, FireFox, Opera, Safari, Konqueror3
        return new XMLHttpRequest();
    } else {
         new XDomainRequest(); //IE8
	        //return null;
    }
}