how to get an embed objet from my page and change his properties

how to get an embed objet from my page and change his properties

hi there

 executing this code :


this is a part of the code that i get on my asp page


<input id="Text1" type="text" value="my_new_folder">
<input type="file" name="ctl00$Main$FileUpload1" id="ctl00_Main_FileUpload1" style="display: none; " width="110" height="30"/>
<embed src="/Web/scripts/uploader.swf?fileUploadID=ctl00_Main_FileUpload1&pagepath=/Web/Process/&buttonText=Buscar archivos&script=/Web/UploadVB.ashx&folder=firstfolder&btnWidth=110&btnHeight=30&wmode=opaque&fileDesc=Image Files&fileExt=*.jpg;*.jpeg;*.gif;*.png;*.tif;*.tiff&multi=true&fileDataName=Filedata" quality="high" width="110" height="30" id="ctl00_Main_FileUpload1Uploader" class="fileUploaderBtn" name="ctl00_Main_FileUpload1Uploader" allowscriptaccess="sameDomain" wmode="opaque" type="application/x-shockwave-flash"/>


how could i get the embed objet ( like i do with document.getelementbyId()), to change the fileuploadstring

that i want to do is:
i need to get the fileuploadid string and change a part of the string

something like this (is only an example that i want to show, obviously the instruction doesnt exist)


onchange (textbox.value) do{

 get object( "embed")
 totalstring=  getstring(" fileuploadid")
totalstring.replace("firstfolder", textbox1.value)
}


i hope you can help me, many thanks in advanced

kind regards