var ar = new Array("<IMG SRC=html/RiceHeaderPic1.jpg WIDTH=760 HEIGHT=250  BORDER=0>", 
"<IMG SRC=html/RiceHeaderPic2.jpg HEIGHT=250 WIDTH=760 BORDER=0>",
"<IMG SRC=html/RiceHeaderPic3.jpg HEIGHT=250 WIDTH=760 BORDER=0>",
"<IMG SRC=html/RiceHeaderPic4.jpg HEIGHT=250 WIDTH=760 BORDER=0>", 
"<IMG SRC=html/RiceHeaderPic5.jpg HEIGHT=250 WIDTH=760 BORDER=0>",
"<IMG SRC=html/RiceHeaderPic6.jpg HEIGHT=250 WIDTH=760 BORDER=0>");

var num = Math.floor(Math.random() * ar.length);
document.write(ar[num]);