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


function change1(image) {
document.home.src = image;
}

function change2(image) {
document.prices.src = image;
}

function change3(image) {
document.services.src = image;
}

function change4(image) {
document.products.src = image;
}

function change5(image) {
document.tips.src = image;
}

function change6(image) {
document.contact.src = image;
}