$(function() {
	$(".img_article_click").click( function() { 
											
	//nbre de photo
	var nb_p=$(".img_article_click").length;
	
	//numero de la photo cliquée
	var n_p=$(this).attr('id').substring(5);
	var avant="<a href='javascript:prev_pic("+n_p+","+nb_p+")' id='prev_pic'>&nbsp;</a>";
	
	
	var apres="<a href='javascript:next_pic("+n_p+","+nb_p+")' id='next_pic'>&nbsp;</a>";
	
		$("body").append("<div id='fd_noir'></div><div id='photo_pop'><div id='navig_pics'>"+avant+" "+apres+"<a href='javascript:hide_pic()' id='close_pic'>&nbsp;</a></div><img src='"+this.src.replace('small','big')+"' id='photo_big' alt='photo'><div>");
		if(n_p==1){$('#prev_pic').hide();}else{$('#prev_pic').show();}
		if(n_p==nb_p){$('#next_pic').hide();}else{$('#next_pic').show();}
		$('#photo_pop').fadeIn("slow");
		$('#fd_noir').height($('body').height());
	 } );
	 
	 
});
function hide_pic(){
	$('#photo_pop').fadeOut("slow",function(){
	$('#photo_pop').remove();
 });
 $('#fd_noir').fadeOut("slow",function(){
	$('#fd_noir').remove();
 });
	
}
function next_pic(x,tot){
	if(x<=tot){
	var nouveau=$('#photo'+x).attr("src").replace('small','big');
	$('#photo_big').attr({src:nouveau});
	
	$('#next_pic').attr({href:"javascript:next_pic("+eval(x+1)+","+tot+")"});
	$('#prev_pic').attr({href:"javascript:prev_pic("+eval(x-1)+","+tot+")"});
	}
	if(x==tot){
	$('#next_pic').hide();}else{$('#next_pic').show();}
	if(eval(x-1)==0){
	$('#prev_pic').hide();}else{$('#prev_pic').show();}
	//alert(x);

}
function prev_pic(x,tot){
	if(x>=0){
	//remplacement de la photo
	var nouveau=$('#photo'+x).attr("src").replace('small','big');
	$('#photo_big').attr({src:nouveau});
	//on traite les prochain
	//on en est à x
	//le suivant est x+1
	//le precedent x-1
	$('#prev_pic').attr({href:"javascript:prev_pic("+eval(x-1)+","+tot+")"});
	$('#next_pic').attr({href:"javascript:next_pic("+eval(x+1)+","+tot+")"});
	}
	if(x==tot){
	$('#next_pic').hide();}else{$('#next_pic').show();}
	if(eval(x-1)==0){
	$('#prev_pic').hide();}else{$('#prev_pic').show();}
	//alert(eval(x-1));

}