function div_showbigger1 () {
document.getElementById ('vdiv1').className = 'big';
document.getElementById ('vdiv2').className = 'small';
document.getElementById ('vdiv3').className = 'small';

document.getElementById ('vteaser1').className = 'hidden';
document.getElementById ('vteaser2').className = 'visible';
document.getElementById ('vteaser3').className = 'visible';

document.getElementById ('vtext1').className = 'visible';
document.getElementById ('vtext2').className = 'hidden';
document.getElementById ('vtext3').className = 'hidden';

}

function div_showbigger2 () {
document.getElementById ('vdiv1').className = 'small';
document.getElementById ('vdiv2').className = 'big';
document.getElementById ('vdiv3').className = 'small';

document.getElementById ('vteaser1').className = 'visible';
document.getElementById ('vteaser2').className = 'hidden';
document.getElementById ('vteaser3').className = 'visible';

document.getElementById ('vtext1').className = 'hidden';
document.getElementById ('vtext2').className = 'visible';
document.getElementById ('vtext3').className = 'hidden';

}

function div_showbigger3 () {
document.getElementById ('vdiv1').className = 'small';
document.getElementById ('vdiv2').className = 'small';
document.getElementById ('vdiv3').className = 'big';

document.getElementById ('vteaser1').className = 'visible';
document.getElementById ('vteaser2').className = 'visible';
document.getElementById ('vteaser3').className = 'hidden';

document.getElementById ('vtext1').className = 'hidden';
document.getElementById ('vtext2').className = 'hidden';
document.getElementById ('vtext3').className = 'visible';

}