var myObjectElement = document.createElement('<object id="elementid" classid="D27CDB6E-AE6D-11cf-96B8-444553540000"></object>');

var myParamElement1 = document.createElement('<Param name=movie value="/ver2/images/common/main_img.swf">');  
var myParamElement2 = document.createElement('<Param name=quality value=high>');


myObjectElement.appendChild(myParamElement1);
myObjectElement.appendChild(myParamElement2);

document.write('<embed src="/ver2/images/common/main_img.swf" quality="high" pluginspage="http://www.macromedia.com/go/getflashplayer" type="application/x-shockwave-flash" width="347" height="281"></embed>');