var opened=false;
window.onload = function()
                {
                        resizeDivHeight = new fx.Height('slider',{duration:2000});
                };

function toggelopen()
{
        if(opened==false){
        resizeDivHeight.custom(0,300);//First Number is starting height, Second is ending height.
        opened=true;
        }
        else
        {
        resizeDivHeight.custom(300,0);//First Number is starting height, Second is ending height.
        opened=false;
        }

}