WB.ExecWB(8,1)打印为什么页面不能横向设置

<object id="Factory" style="display:none" viewastext
codeBase=http://www.meadroid.com/scriptx/ScriptX.cab#Version=5,60,0,360
classid=clsid:1663ed61-23eb-11d2-b92f-008048fdd814 viewastext>
</object>
<input type="button" value="打    印" onclick="Factory.printing.Print(true)">
<input type="button" value="页面设置" onclick="Factory.printing.PageSetup()">
<input type="button" value="打印预览" onclick="Factory.printing.Preview()">
<input type="button" value="横向设置" onclick="SetPrintSettings()">
<script>
function SetPrintSettings()
{ 
try
{
Factory.printing.SetMarginMeasure(2);
Factory.SetPageRange(false,1,3);
Factory.printing.printer="HP DeskJet 870C";
Factory.printing.copies=2;
Factory.printing.collate=true;
Factory.printing.paperSize="A4";
Factory.printing.paperSource="Manual feed";

Factory.printing.header="This is MeadCo";
Factory.printing.footer="Advanced Printing by ScriptX";
Factory.printing.portrait=false;
Factory.printing.leftMargin=1.0;
Factory.printing.topMargin=1.0;
Factory.printing.rightMargin=1.0;
Factory.printing.bottomMargin=1.0;
}
catch(e)
{}
} 
</script>