function upload(){
  var isIE = document.all && window.external; 
if(!isIE)
{
alert('抱歉，目前上传功能只支持IE浏览器');
															return;
}
												try
												{											
												var obj = frames["upfile"].document.forms["upfile"];														
													obj.File1.click();
													var Exp = obj.File1.value;
													if(Exp.length > 3)
													{
														Exp = Exp.substring(Exp.length-3,Exp.length);
														Exp=Exp.toUpperCase();
														var explist="ZIP,RAR,PNG,JPG,GIF,SWF,DOC,PPT,XLS,PDF,TXT,CHM,UMD,BMP,PSD,.NH,KDH,CAJ";
														if(explist.indexOf(Exp)==-1)
														{
															alert('不支持此上传文件格式');
															return;
														}
														else
														{
														 													MessageBox.alert('上传中,请稍后',CancalUpload);															
														}
													}
													else
													{
														return;
													}
													obj.submit();
													
												}
												catch(err)
												{
													alert('上传失败,请确认文件大小不能超过10M');
													window.top.document.getElementById("upfile").src ="include/upfile.aspx";
												}
											}
											function CancalUpload()
											{
												document.frames.item("upfile").location.href="include/upfile.aspx";
											}
											
											function setContent(str)
											{
												if(str != "")
												{
													MessageBox.close();
													var obj=document.getElementById('TopicContent'); 
													obj.value = obj.value + str;
													CancalUpload();
												}
												else
												{													
													document.getElementById("message").innerHTML="上传失败,请确认文件大小不能超过10M";
												}
											}			
												function AddUrl(type)
												{
												var url=prompt("请输入URL地址","");
												if(url==null)
												return;
												var checkfiles=new RegExp("((^http)|(^https)|(^ftp)):\/\/(\\w)+\.(\\w)+");
												if(checkfiles.test(url))
												{
													var val=document.getElementById("TopicContent").value;
													if(type==2)
													val=val+"[RAR]"+url+"[/RAR]";
													else
													{
														var Exp = url.substring(url.length-3,url.length);
														if(Exp!= 'jpg' && Exp!='JPG' && Exp!='gif' && Exp!='GIF' && Exp!='Gif' && Exp!='png' && Exp!='PNG' && Exp!='Jpg')
														{
															alert('只能插入jpg,png,gif格式的网络图片');
															return;
														}
														val=val+"[IMG]"+url+"[/IMG]";
													}
													document.getElementById("TopicContent").value=val;
												}
												else
													alert("URL地址无效");
												}	

function keyup(eventobject)
												{
													if(event.ctrlKey && window.event.keyCode==13 && document.post.Submit.disabled==false)
													{
														document.post.submit();
													}
												}