a1=new Image()
a1.src ='images/boutrond1.gif'
a2=new Image()
a2.src ='images/boutrond2.gif'
function pop1(image) {
             window.document.logo1.src=image.src
                      }
function pop2(image) {
             window.document.logo2.src=image.src
                      }
function pop3(image) {
             window.document.logo3.src=image.src
                      }
function pop4(image) {
             window.document.logo4.src=image.src
                      }
function pop5(image) {
             window.document.logo5.src=image.src
                      }
function pop6(image) {
             window.document.logo6.src=image.src
                      }
function pop7(image) {
             window.document.logo7.src=image.src
                      }