请大家伙儿帮忙看看，为什么这段代码有的能替换有的不能替换

		Dim m_playurl,mcj,mcj1,mcj2,mcj3,mcj4,mcj5,mcj6,mcj7,mcj8

			m_playurl="^var govspx19613=""Fi7.imgs.letv.com%"";var n35754=""Bbdhd%3A%"";var pp_play=""DVD%E7%89%88%67876365edczd""+2+""B%""+2+""Bhttp%3A%""+2+""F%""+2+govspx19613+2+'6722027pargu'+2+""FswfPlayer.swf%3FautoPlay%3D1%20856457fkluy""+2+""6id%3D19""+2+""873944308ejueb""""+2+'55874932icwhx'+2+""""4%""+2+""4%""+2+'26169293estac'+2+""B%""+2+n35754+2+""F%""+2+""F""+2+""9985609%7CEB961064E957D941D3E65A11587F44413067367tocpc""+2+""%7C%E8%B8%AE%E8%B5%B7%E8%84%9A%E5%B0%96+%E5%BE%AE%E7%94%B5%E5%BD%B1.flv""+2+"""";pp_play=pp_play.replace(""67876365edczd"","""").replace(""6722027pargu"",""Fplayer%"").replace('20856457fkluy','').replace(""73944308ejueb"","""").replace(""55874932icwhx"",""31%"").replace(""26169293estac"",""4DVD%E7%89%88%"").replace(""13067367tocpc"","""");pp_play=pp_play.substring(0,pp_play.length-1);"

			mcj=extract(m_playurl,"^","var pp_play")

			mcj5=extract(m_playurl,";pp_play=pp_play",";")		

			mcj4=extract(m_playurl,"var pp_play=",";")			

			  if mcj<>"" then

			  mcj = split(mcj,";")

			  for i = 0 to Ubound(mcj) 

				if trim(mcj(i))<>"" then

				mcj1=split(replace(mcj(i),"var ",""),"=")

				mcj2=mcj1(0)				

				mcj3=mcj1(1)

				mcj4 = replace(mcj4,mcj2,mcj3)

				end if

			  next

			  end if

			  if mcj5<>"" then

			  mcj8=mcj4

			  mcj5 = split(mcj5,".replace")

			  for j = 0 to Ubound(mcj5) 

				if trim(mcj5(j))<>"" then

				mcj6=extract(mcj5(j),"(",",")

				mcj6=replace(replace(mcj6,chr(34),""),"'","")

				mcj7=extract(mcj5(j),","&chr(34),chr(34)&")")

				mcj4 = replace(mcj8,mcj6,mcj7)

				end if

			  next			  

			  end if

			  Response.write mcj4

			function extract(from,s_start,s_end)'取指定字符中间的字符

				dim pos_start,pos_end,rtn

				rtn="" 	

				pos_start=instr(from,s_start)

				if pos_start>0 then

					pos_start=pos_start+len(s_start)

					pos_end=instr(pos_start,from,s_end)

					if pos_end > pos_start then

						rtn=mid(from,pos_start,pos_end-pos_start)

					end if

				end if

				extract=rtn

			end function

"DVD%E7%89%88%67876365edczd"+2+"B%"+2+"Bhttp%3A%"+2+"F%"+2+"Fi7.imgs.letv.com%"+2+'6722027pargu'+2+"FswfPlayer.swf%3FautoPlay%3D1%20856457fkluy"+2+"6id%3D19"+2+"873944308ejueb""+2+'55874932icwhx'+2+""4%"+2+"4%"+2+'26169293estac'+2+"B%"+2+"Bbdhd%3A%"+2+"F%"+2+"F"+2+"9985609%7CEB961064E957D941D3E65A11587F444"+2+"%7C%E8%B8%AE%E8%B5%B7%E8%84%9A%E5%B0%96+%E5%BE%AE%E7%94%B5%E5%BD%B1.flv"+2+""

DVD%E7%89%88%2B%2Bhttp%3A%2F%2Fi7.imgs.letv.com%2Fplayer%2FswfPlayer.swf%3FautoPlay%3D1%26id%3D1928231%24%24%24DVD%E7%89%88%2B%2Bbdhd%3A%2F%2F29985609%7CEB961064E957D941D3E65A11587F4442%7C%E8%B8%AE%E8%B5%B7%E8%84%9A%E5%B0%96+%E5%BE%AE%E7%94%B5%E5%BD%B1.flv

<script language="javascript" runat="server">

var str=Request.Form("m_playurl");

str=eval(str + "");   //保证是String 类型

</script>

<%

Response.write str

%>