function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}

function MM_openBrWindow(theURL,winName,features) { //v2.0
  window.open(theURL,winName,features);
}

function chk_mail(checkobject) {
if (checkobject.value == "" ||  checkobject.value.indexOf == -1 ){
		alert("電子郵件欄不可為空白！");
		checkobject.focus();
	} else  if ( checkobject.value == "" || ( checkobject.value.indexOf('@',0) == -1 ||	checkobject.value.indexOf('.',0) == -1 )) {
		alert("你所輸入的電子郵件不合法！");
		checkobject.focus();
	}  else  {
		return true;
	}
	return false;
}