Useful Left Menu

http://www.dynamicdrive.com/dynamicindex17/ddaccordionmenu-urban.htm

http://www.dynamicdrive.com/dynamicindex17/ddaccordionmenu-bullet.htm

http://www.w3csolutions.com/website-resources/Vertical-Menu/jQuery-Menu/Multilevel-Vertical-Menu/index.html

http://www.w3csolutions.com/website-resources/Vertical-Menu/jQuery-Menu/accordion-menu-jq/

http://www.designchemical.com/lab/jquery-vertical-mega-menu-plugin/examples/#

http://webdesign.tutsplus.com/tutorials/site-elements/orman-clarks-vertical-navigation-menu-the-css3-version/

http://www.designchemical.com/lab/jquery-vertical-mega-menu-plugin/advanced-styling/#