function toggleLeftNav(oNav) {
    var oNavId = oNav.id;
    var oNavIdLength = oNavId.length;
    var navIndex = oNavId.charAt(oNavIdLength - 1);
    var navList = jQuery("#navlist" + navIndex);
    var navListHr = jQuery("#navlist" + navIndex + "tophr");
    
    if(oNav.src.indexOf('arrowdown') == -1){
        oNav.src = '/framework/images/global/arrowdown.png';
        oNav.alt = 'Expand';
        navList.css("display","none");
        navListHr.css("display","none");
    }
    else{
        oNav.src = '/framework/images/global/arrowup.png';
        oNav.alt = 'Collapse';
        navList.css("display","block");
        navListHr.css("display","block");
    }
}