creating multi column single or more level menu

Hi all,

I have develop a theme to use in WordPress. I have used sevel jQuery items in the site and also used modernizr-2.6.1.min library and couple of script for the menu. I also have some classes and divs inside the ul and li. I also ul under ul that shows up beside other ul. can check the following code to be more specific.

<div  class="header">
					<div id="MDDNav">
							<ul>
								<li class="navlink">
									<div  class="tab"> <a href="index.html">Home</a>
									</div>

								</li>
								<li class="navlink">
									<div  class="tab"> <a href="principal.html">CEO</a></div>

								</li>

							<li class="navlink">
								<div  class="tab"><a href="services.html">Services</a>
								</div>
								<div  class="mdd">
									<div class="panel">
										<div class="column">
											<ul class="group">
												<!-- <li class="mdd-item"><a href="" class="item-link landing">Management Audit</a></li> -->
												<li class="mdd-item"><a href="" class="item-link"> Cost & Cost Accounting System Consultancy</a></li>
												<li class="mdd-item"><a href="" class="item-link">Cost Audit</a></li>
												<li class="mdd-item"><a href="" class="item-link">Management Audit</a></li>
												<li class="mdd-item"><a href="" class="item-link">Management Consultancy</a></li>
												<li class="mdd-item"><a href="" class="item-link"> Financial Management Consultancy</a></li>
												<li class="mdd-item"><a href="" class="item-link"> Internal Control System Consultancy</a></li>
												<li class="mdd-item"><a href="" class="item-link"> Internal Audit</a></li>
												<li class="mdd-item last"><a href="" class="item-link">System Design for ERP Solutions</a></li>
											</ul>
										</div>
										<div class="column">
											<ul class="group">
												<!-- <li class="mdd-item"><a href="" class="item-link landing">Tax</a></li> -->
												<li class="mdd-item"><a href="" class="item-link"> Financial Consultancy</a></li>
												<li class="mdd-item"><a href="" class="item-link"> Arranging Foreign and Local Loans</a></li>
												<li class="mdd-item"><a href="" class="item-link"> Preparation of Project Profile & Feasibility</a></li>
												<li class="mdd-item"><a href="" class="item-link"> Company matters.</a></li>
												<li class="mdd-item"><a href="" class="item-link"> IPO related Consultancy</a></li>
												<li class="mdd-item"><a href="" class="item-link"> Financial Analysis</a></li>
												<li class="mdd-item"><a href="" class="item-link">Share management/Portfolio Management</a></li>
												<li class="mdd-item last"><a href="" class="item-link">HR and Admin related Consultancy</a></li>
												<!-- <li class="mdd-item last"><a href="" class="item-link landing all">All Tax services »</a></li> -->
											</ul>
											<!-- <ul class="group second">
												<li class="mdd-item last"><a href="" class="item-link landing">Tax rates online</a></li>
											</ul> -->
										</div>
										<div class="column">
											<ul class="group">
												<li class="mdd-item"><a href="" class="item-link">Strategic Planning</a></li>
												<li class="mdd-item"><a href="" class="item-link">Development of Management Reporting and MIS.</a></li>
												<li class="mdd-item"><a href="" class="item-link"> Work Study Management System</a></li>
												<li class="mdd-item"><a href="" class="item-link">Production Management & Monitoring System.</a></li>
												<li class="mdd-item"><a href="" class="item-link"> Development of Proper Budgetary Control System</a></li>
												<li class="mdd-item"><a href="" class="item-link">Development of Integrated Supply Chain Management System.</a></li>
												<li class="mdd-item"><a href="" class="item-link"> Consultancy in new business set up, particularly in Real Estate, Amusement parks, Hotels,Motels, Restaurant, Garments, Textile, Dredging, Ship Building, Inland Terminal Port, etc.</a></li>
												<li class="mdd-item"><a href="" class="item-link">Business Development</a></li>
												<li class="mdd-item"><a href="" class="item-link"> Credit Analysis</a></li>
												<li class="mdd-item last"><a href="" class="item-link">Income Tax, Custom Duty and VAT Consultancy</a></li>

											</ul>
										</div>
										<div class="clr"></div>
									</div>
								</div>
							</li>
							<li class="navlink">
								<div  class="tab"><a href="">Research</a>
								</div>
							</li>
							<li class="navlink last">
								<div  class="tab"><a href="contact.html">Contacts</a>
								</div>
							</li>

						</ul>
					</div>
				</div><!-- end: "#header" -->

All what I am looking for is create my own menu in wp. may creating widget or plugh but the one i have here. I dont want dump all my code and start developing my menu using any other plugin. So that I can learn how all it works and never have look back for any menu.

thank you very much in advance for your replies.