images = new Array(6);

images[0] = "<img id='imagerandom-leftcolumn' src='images/leftcolumn/leftimage_01.gif' width='210' height='448' alt='Underwater'>";

images[1] = "<img id='imagerandom-leftcolumn' src='images/leftcolumn/leftimage_02.gif' width='210' height='448' alt='Underwater'>";

images[2] = "<img id='imagerandom-leftcolumn' src='images/leftcolumn/leftimage_03.gif' width='210' height='448' alt='Underwater'>";

images[3] = "<img id='imagerandom-leftcolumn' src='images/leftcolumn/leftimage_04.gif' width='210' height='448' alt='Underwater'>";

images[4] = "<img id='imagerandom-leftcolumn' src='images/leftcolumn/leftimage_05.gif' width='210' height='448' alt='Underwater'>";

images[5] = "<img id='imagerandom-leftcolumn' src='images/leftcolumn/leftimage_06.gif' width='210' height='448' alt='Underwater'>";

index = Math.floor(Math.random() * images.length);

document.write(images[index]);