Some fundamental questions

Hi Folks,

I'd like to develop a small web application using Seaside. I could it develop 
in CGI/Perl but I'd like to use a new approach - seaside.
But because Smalltalk/Seaside is so extensive before I start I have some 
fundamental question about the abilities of seaside, particularly of 
rendering html.

An example:
<td><input type="text" name="w2txt" size="60" maxlength="60" 
onDblclick="RightClick(this,2)" onFocus=LeaveTxT(this,"#ffff99") 
onBlur="SetColor(this,'White')"  onChange=LeaveTxT(this,"White")></td>

All of this possible?

onDblclick="RightClick(this,2)"
onFocus=LeaveTxT(this,"#ffff99")
onBlur="SetColor(this,'White')"
onChange="TesteZahl(this,this.value,0,2)"
window.open("datei.htm", "Fenster2", "width=310,height=400,left=320,top=0");

using JavaScript?

and so on.

What are the limitations of Seaside in contrast of conventionally html/cgi 
programming?

Thx
Timothy