// JavaScript Document
// Image randomisation for the SOCSI homepage
//
// UPDATES
// 03.01.08 sagba
// 			Two additional images added to the arrays
//

// SET Path to images folder
var path="/socsi/images/";
// Rx Publishing variables
var prefix="image-";
var suffix="-web";
var type=".jpg";
// English content (Use Rx Content ID of published items)
	var arrEnglishImages = new Array('38242','38243','38244','38245','38246','38247','38248','82535','82536');
// Matching alt tags for images
	var arrEnglishAlts = new Array('Students relaxing in Bute Park','Alexandra Gardens','The School of Social Sciences','The School of Social Sciences Building','Cardiff Civic Centre','Social Science Lecture','Tutorial Session','Social Sciences Lecture','PGCE Tutorial');
// Welsh content
	var arrWelshImages = new Array('38242','38243','38244','38245','38246','38247','38248','82535','82536');
// Matching alt tags for images
	var arrWelshAlts = new Array('Myfyrwyr yn ymlacio ym Mharc Bute','Gerddi Alexandra','Adeilad yr Ysgol Gwyddorau Cymdeithasol','Adeilad yr Ysgol Gwyddorau Cymdeithasol','Canolfan Dinesig Caerdydd','Darlith Gwyddorau Cymdeithasol','Sesiwn Tiwtorial','Darlith Gwyddorau Cymdeithasol','Sesiwn Tiwtorial');
// Array setup
var arrImageUsed = new Array();
var intImages = arrEnglishImages.length;
var intImagesUsed=0;
for (var i=0;i<this.arrEnglishImages.length;i++) this.arrImageUsed[i]=0;

function fnGetRandomNumber()
{
  var ranNum= Math.abs(Math.round(Math.random()*intImages-1));
  return ranNum;
}

function fnGetRandomImageHTML(lang) {
   var retHTML = "";
   var intImageToUse=fnGetRandomNumber();

  if (intImagesUsed<intImages)
   {
		while (arrImageUsed[intImageToUse]>0)
		{
			intImageToUse=fnGetRandomNumber();
		}

		arrImageUsed[intImageToUse]=1;
		intImagesUsed++;
		if (lang=="en") retHTML = retHTML + "<img src="+path+prefix+arrEnglishImages[intImageToUse]+suffix+type+" alt="+arrEnglishAlts[intImageToUse]+" />"
		if (lang=="cy") retHTML = retHTML + "<img src="+path+prefix+arrWelshImages[intImageToUse]+suffix+type+" alt="+arrWelshAlts[intImageToUse]+" />"
   }
   return retHTML;
}
//