怎么在模态窗口（showModalDialog）调用打印预览
弹出的模态窗口（子窗口）中调用IE的打印预览功能，结果IE弹出错误:“当前页面发生脚步错误...错误：不支持该命令 代码：0”，
我的打印预览代码如下(打印没问题)：
<OBJECT classid='CLSID:8856F961-340A-11D0-A96B-00C04FD705A2' height=0 id=wb name=wb width=0> </OBJECT>
<div style="margin-left:150px">
<input type='button' name='Submit1' value='- 打印 -' onclick='window.print();' class='noprint'/>
<input type='button' name='Submit2' value='-打印预览-' onclick='wb.execwb(7,1);' class='noprint'/>
请朋友们共同研究.
如果不用模态窗口（showModalDialog）打印预览是可以的
母窗口代码
a.html
<HTML><HEAD><TITLE>showModelessDialogEX.htm</TITLE><SCRIPT>var sUserName="";function fnCallDialog(){ showModalDialog("b.html",window,"status:false;dialogWidth:300px;dialogHeight:300px");}function fnUpdate(){ oName.innerText = sUserName;}</SCRIPT></HEAD><BODY><P>Enter your first name: <SPAN ID="oName" STYLE="color:red;font-size:24">Joan</SPAN></P><INPUT TYPE="button" VALUE="Display Modeless Dialog" onClick="fnCallDialog()"></BODY></HTML><HTML> <HEAD><TITLE>myDialog.htm</TITLE><SCRIPT> function fnGetInfo() { var sData = dialogArguments; //父窗口sData.sUserName = oEnterName.value; sData.fnUpdate(); }function fnCancel() { var sData = dialogArguments; sData.sUserName = "Joan"; sData.fnUpdate(); }</SCRIPT></HEAD> <BODY><LABEL FOR="oEnterName" ACCESSKEY="f">Enter your <SPAN STYLE="text-decoration:underline">F</SPAN>irst Name</LABEL><OBJECT classid='CLSID:8856F961-340A-11D0-A96B-00C04FD705A2' height=0 id=wb name=wb width=0></OBJECT><INPUT ID=oEnterName><BR><BR><INPUT VALUE="Apply" TYPE=button onClick="fnGetInfo();"> <INPUT VALUE="Ok" TYPE=button onClick="fnGetInfo();window.close();"> <INPUT VALUE="Cancel" TYPE=button onClick="fnCancel();window.close();"> <input type='button' name='Submit2' value='-打印预览-' onclick='wb.execwb(7,1);' class='noprint'/></BODY> </HTML>