var sblogo = new Array() 

sblogo[0] = '/common/images/logo/big-logo_01.png'
sblogo[1] = '/common/images/logo/big-logo_02.png'
sblogo[2] = '/common/images/logo/big-logo_03.png'
sblogo[3] = '/common/images/logo/big-logo_04.png'

var j = 0
var p = sblogo.length;
var preBuffer = new Array()

for (i = 0; i < p; i++){
   preBuffer[i] = new Image()
   preBuffer[i].src = sblogo[i]
}

var whichImage = Math.round(Math.random()*(p-1));

function showBigImage(){
document.write('<img class="bigLogo" src="'+sblogo[whichImage]+'" alt="showbox">');
}



var sblogoSmall = new Array() 

sblogoSmall[0] = '/common/images/logo/small-logo_01.png'
sblogoSmall[1] = '/common/images/logo/small-logo_02.png'
sblogoSmall[2] = '/common/images/logo/small-logo_03.png'
sblogoSmall[3] = '/common/images/logo/small-logo_04.png'

var j = 0
var p = sblogoSmall.length;
var preBuffer = new Array()

for (i = 0; i < p; i++){
   preBuffer[i] = new Image()
   preBuffer[i].src = sblogoSmall[i]
}

var whichImage = Math.round(Math.random()*(p-1));

function showSmallImage(){
document.write('<img class="smallLogo" src="'+sblogoSmall[whichImage]+'" alt="showbox">');
}