prototype.js  冲突?  如果去掉prototype.js 这个叶面运行正常  麻烦熟悉prototype.js 的指导一下
<!DOCTYPE   HTML   PUBLIC    "-//W3C//DTD   HTML   4.0   Transitional//EN "   >  
  <HTML>  
 	 <HEAD>  
 		 <title> a </title>  
 		 <META   http-equiv= "Content-Type "   content= "text/html;   charset=utf-8 ">  
 	             <META   content= "MSHTML   6.00.3790.2666 "   name= "GENERATOR ">  </HEAD>  
 		 <SCRIPT   language= "JavaScript "   src= "/dbfdc/control/js/prototype.js "   type= "text/javaScript ">  </SCRIPT>  
 		 <meta   name= "vs_targetSchema "   content= "http://schemas.microsoft.com/intellisense/ie5 ">  
 	 </HEAD>  
 	 <body   MS_POSITIONING= "GridLayout ">  
 		 <form   id= "Form1 "   method= "post "   runat= "server ">  
 			 <DIV   id= "com_item ">  </DIV> 					 
 			 <SCRIPT   language= "JavaScript ">  
 this.sel   =   new   Array(); 
 this.urlArr   =   new   Array(); 
 this.imgArr   =   new   Array(); 
 this.sel_num   =   0;   
 function   comchk()   { 
 	if(sel_num    <   2)   { 
 		alert( '请至少选择两个楼盘! ') 
 	}else   { 
 		out   =    ' '; 
 		i=0; 
 		for(keay   in   sel){ 
 			++i; 
 			//out   +=    "seq "   +   i   +    "= "   ; 
 			out   +=keay+ ', ';   
 		} 
 		//var   str   =    "http://localhost/notebook/cgi-bin/notebook/compare.php?d_id= "+out; 
 		var   str   =    "http://php.tech.sina.com.cn/notebook/compare.php?d_id= "+out; 
 		window.open(str); 
 		//window.open(str); 
 		//window.open(str); 
 	} 
 } 
 function   addhouse(idd,nm,myImg,myURL)   { 
 	if(!sel[idd])   { 
 		if(sel_num   > =   4)   { 
 			alert( '最多只能有4个楼盘参加比较! '); 
 		}else   { 
 			sel_num++; 
 			sel[idd]   =   nm; 
 			imgArr[idd]   =   myImg; 
 			urlArr[idd]   =   myURL;  			 
 		} 
 	}else   { 
 		alert(   nm+ '   已选择! '); 
 	} 
 	draw(); 
 } 
 function   delhouse(id)   { 
 	sel2   =   new   Array(); 
 	for(keay   in   sel)   { 
 		if(id!=keay)   { 
 			sel2[keay]   =   sel[keay]; 
 		} 
 	} 
 	sel   =   sel2; 
 	sel_num--; 
 	draw(); 
 } 
 function   draw()   { 
 	out   =    ' '; 
 	alert(sel); 
 	for(keay   in   sel)   { 
 		out   +=    " <table   width=150   border=0   cellpadding=0   cellspacing=0>  <tr>  <td   height=6   background=images/nt050.gif>  </td>  </tr>  <tr>  <td>  <img   src=http://image2.sina.com.cn/IT/notebook/hz/images/nt031.gif   width=150   height=6>  </td>  </tr>  <tr>  <td   background=images/nt032.gif   align=right   style= 'padding-right:3px; '>  <a   href=javascript:del( ' "+keay+ " ')>  <img   src=images/nt049.gif   width=12   height=12>  </a>  </td>  </tr>  <tr>  <td   background=images/nt032.gif   style= 'paddi