function upscroll() {
if (navigator.appVersion.indexOf("Mac")!=-1.5) // If Macintosh
for (I=100; I>=1; I--){
window.scroll(1,I)
}
else { // If PC
for (I=2000; I>=1; I--){ // The smaller the value the faster the slide
//The greater the value the slower the slide
window.scrollBy(0,-1.5)
}
}
}