/**
 * 获取fckEditor的对象
 * instanceName为其他实例名
 */
function getFckEditor(instanceName){
	eval("var Editor =window."+instanceName+"___Frame"+".FCKeditorAPI.GetInstance('"+instanceName+"');");
	return Editor;
}
/**
 * 获取fckEditor的内容
 */
function getFckContent(instanceName){
	var Editor =getFckEditor(instanceName);
	var content=Editor.GetXHTML(true);
	return content;
}
/**
 * 设置fck的内容
 */
function setFckContent(instanceName,contentStr){
	var Editor =getFckEditor(instanceName);
	Editor.SetHTML(contentStr);	
}