function initArray() {

this.length = initArray.arguments.length;
  for (var i = 0; i < this.length; i++) {
  this[i] = initArray.arguments[i];
  }
}

function showBanner() {


//This is the list of links
//*********************************************************************************

link = new initArray(

"http://www.trustlocums.co.uk",
"http://www.trustlocums.co.uk",
"http://www.nasgp.org.uk/bannerads/gpupdate",
"http://www.nasgp.org.uk/bannerads/gpupdate",
"http://www.nasgp.org.uk/bannerads/pallant_medical",
"http://www.nasgp.org.uk/bannerads/pallant_medical",
"http://www.masterclasses.bmj.com/GPs",
"http://www.masterclasses.bmj.com/GPs"
);


//This is the list of image names (including the folder path from this script)
//*********************************************************************************

image = new initArray(


"/bannerads/trustlocums.gif",
"/bannerads/trustlocums.gif",
"/bannerads/gp_update.gif",
"/bannerads/gp_update.gif",
"/bannerads/pallant_medical.jpg",
"/bannerads/pallant_medical.jpg",
"/bannerads/BMJ-Video-General-468x60.gif",
"/bannerads/BMJ-Video-General-468x60.gif"
);


//This is the list of alt text
//*********************************************************************************

text = new initArray(


"Trust Locums",
"Trust Locums",
"GP Update",
"GP Update",
"Pallant Medical",
"Pallant Medical",
"BMJ Masterclasses",
"BMJ Masterclasses"
);


var bannercount = 8; //Change this value to be the same as the number of rows in the lists above

var random_num = (Math.round((Math.random()* (bannercount - 1))))
var random_link  = link[random_num];
var random_image = image[random_num];
var random_text  = text[random_num];

var linkstart = '';
var linkend = '';

if (random_link != '') {
	linkstart = '<a href=\"'+random_link+'\" target=\"_blank\">';
	linkend = '</a>';
}

if (linkstart != '' && linkend != '') {
	document.write(linkstart+'<img src=\"'+random_image+'\" border=\"0\" alt=\"'+random_text+'\">'+linkend);
} else {
	document.write('<img src=\"'+random_image+'\" border=\"0\" alt=\"'+random_text+'\">');
}

}