var DS_Pics=new Array();

DS_Pics[0]="pic/winter.jpg";

DS_Pics[1]="pic/lente.jpg";

DS_Pics[2]="pic/zomer.jpg";

DS_Pics[3]="pic/herfst.jpg";

var DS_Date=new Date();

var d=DS_Date.getDate();

var m=DS_Date.getMonth()+1;

var s;

if(m>=1&&m<=3)s=0;

if(m==3&&d>19)s=1;

if(m>3&&m<=6)s=1;

if(m==6&&d>20)s=2;

if(m>6&&m<=9)s=2;

if(m==9&&d>21)s=3;

if(m>9&&m<=12)s=3;

if(m==12&&d>20)s=0;

if(document.body)

document.body.background=DS_Pics[s];