if (document.images) {
                   var m1a = new Image()
                   m1a.src = "images/m_pads.gif"
                   var m1b = new Image()
                   m1b.src = "images/m_pads_on.gif"
                   var m2a = new Image()
                   m2a.src = "images/m_hooks.gif"
                   var m2b = new Image()
                   m2b.src = "images/m_hooks_on.gif"
                   var m3a = new Image()
                   m3a.src = "images/m_studs.gif"
                   var m3b = new Image()
                   m3b.src = "images/m_studs_on.gif"
                   var m4a = new Image()
                   m4a.src = "images/m_order.gif"
                   var m4b = new Image()
                   m4b.src = "images/m_order_on.gif"
                   var m5a = new Image()
                   m5a.src = "images/m_contact.gif"
                   var m5b = new Image()
                   m5b.src = "images/m_contact_on.gif"

                   var p1b = new Image()
                   p1b.src = "images/order/cab1a.gif"
                   var p2b = new Image()
                   p2b.src = "images/order/cab2a.gif"
                   var p3b = new Image()
                   p3b.src = "images/order/cab3a.gif"
                   var p4b = new Image()
                   p4b.src = "images/order/cab4a.gif"
                   var p5b = new Image()
                   p5b.src = "images/order/cab5a.gif"
                 }

function act(imgName) {
                   if (document.images) {

                     document[imgName].src = eval(imgName + 'b.src')
            			}
                     }

function inact(imgName) {
                   if (document.images) {
                     document[imgName].src = eval(imgName + 'a.src')
                     }
                 }