var extention = ".jpg" ;
var nbimage = 29 ;
var numimage1;
var numimage2;
var numimage3;
var url;
var	rep = "img_random"; 
var alt;

function imageRandom1()
	{
	numimage1 = Math.round( Math.random() * ( nbimage - 1 ) + 1 );
	url = 'images/ipdev/' + rep + '/' + numimage1 + extention ;
	document.write ('<img src="' + url + '" alt="' + alt + '">');
	}

function imageRandom2()
	{
	numimage2 = Math.round( Math.random() * ( nbimage - 1 ) + 1 );
	if (numimage2 == numimage1)
		{
		imageRandom2();
		}
	else
		{
		url = 'images/ipdev/' + rep + '/' + numimage2 + extention ;
		document.write ('<img src="' + url + '" alt="' + alt + '">');
		}
	}

function imageRandom3()
	{
	numimage3 = Math.round( Math.random() * ( nbimage - 1 ) + 1 );
	if ((numimage3 == numimage1) || (numimage3 == numimage2))
		{
		imageRandom3();
		}
	else
		{
		url = 'images/ipdev/' + rep + '/' + numimage3 + extention ;
		document.write ('<img src="' + url + '" alt="' + alt + '">');
		}
	}