//判断fck的内容是否为空
var oEditor = FCKeditorAPI.GetInstance('content'); //这里的content是FCK的ID值
if(GetLength("content")<=0) {
alert('内容不能为空!');
oEditor.Focus();
return false;
}


function GetLength(str){
var oEditor = FCKeditorAPI.GetInstance(str) ;
var checkContent= oEditor.EditorDocument ;
var contentLength ;
if ( document.all ){
contentLength= checkContent.body.innerText.trim().length ;
}
else{
var r = checkContent.createRange() ;
r.selectNodeContents( checkContent.body ) ;
contentLength= r.toString().trim().length ;
}
return contentLength;
}

//去掉字符串的空格
String.prototype.trim = function()
{
return this.replace(/(^[\s]*)|([\s]*$)/g, "");
}