function changeImage1(){ document.myimg.src="img/product/de_bo1b.gif"; }
function changeImage2(){ document.myimg.src="img/product/de_bo1.gif"; }
function changeImage3(){ document.myimg2.src="img/product/de_bo2b.gif"; }
function changeImage4(){ document.myimg2.src="img/product/de_bo2.gif"; }
function changeImage5(){ document.myimg3.src="img/product/de_bo3b.gif"; }
function changeImage6(){ document.myimg3.src="img/product/de_bo3.gif"; }
function changeImage7(){ document.myimg4.src="img/product/de_bo4b.gif"; }
function changeImage8(){ document.myimg4.src="img/product/de_bo4.gif"; }

function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}