function button_a_hover(){if (document.images){document.images['button1'].src=menu_button_a_hover.src;}}
function button_a(){if (document.images){document.images['button1'].src=menu_button_a.src;}}
function button_b_hover(){if (document.images){document.images['button2'].src=menu_button_b_hover.src;}}
function button_b(){if (document.images){document.images['button2'].src=menu_button_b.src;}}
function button_c_hover(){if (document.images){document.images['button3'].src=menu_button_c_hover.src;}}
function button_c(){if (document.images){document.images['button3'].src=menu_button_c.src;}}
function button_d_hover(){if (document.images){document.images['button4'].src=menu_button_d_hover.src;}}
function button_d(){if (document.images){document.images['button4'].src=menu_button_d.src;}}
function button_e_hover(){if (document.images){document.images['button5'].src=menu_button_e_hover.src;}}
function button_e(){if (document.images){document.images['button5'].src=menu_button_e.src;}}

menu_button_a_hover = new Image();menu_button_a_hover.src="../images/menu_familientherapie_hover.png"
menu_button_a = new Image();menu_button_a.src="../images/menu_familientherapie.png"
menu_button_b_hover = new Image();menu_button_b_hover.src="../images/menu_babyportal_hover.png"
menu_button_b = new Image();menu_button_b.src="../images/menu_babyportal.png"
menu_button_c_hover = new Image();menu_button_c_hover.src="../images/menu_erziehungsberatung_hover.png"
menu_button_c = new Image();menu_button_c.src="../images/menu_erziehungsberatung.png"
menu_button_d_hover = new Image();menu_button_d_hover.src="../images/menu_eltern_kind_gruppen_hover.png"
menu_button_d = new Image();menu_button_d.src="../images/menu_eltern_kind_gruppen.png"
menu_button_e_hover = new Image();menu_button_e_hover.src="../images/menu_entspannung_hover.png"
menu_button_e = new Image();menu_button_e.src="../images/menu_entspannung.png"