var size=new Array(7);
size[0]="62.5%";size[1]="68.75%";size[2]="75%";size[3]="81.25%";size[4]="87,5%";size[5]="93.75%";size[6]="100%";
var current=0;
function charsize(step)
{
document.body.style.fontSize = size[current+step];
current = current+step;
}