// 팝업창 중앙으로 위치 
function center(){ 
    var x,y; 
    if (self.innerHeight) { // IE 외 모든 브라우저 
        x = (screen.availWidth - self.innerWidth) / 2; 
        y = (screen.availHeight - self.innerHeight) / 2; 
    }else if (document.documentElement && document.documentElement.clientHeight) { // Explorer 6 Strict 모드 
        x = (screen.availWidth - document.documentElement.clientWidth) / 2; 
        y = (screen.availHeight - document.documentElement.clientHeight) / 2; 
    }else if (document.body) { // 다른 IE 브라우저( IE < 6) 
        x = (screen.availWidth - document.body.clientWidth) / 2; 
        y = (screen.availHeight - document.body.clientHeight) / 2; 
    } 
    window.moveTo(x,y); 
}