/* Fonction pour la scollBar  */

$(window).bind('load',function() {
	
	if( $("#interne").length !== 0 ) {
		
		$("#scroll_vertical").css('overflow', 'hidden');
	
		var top1 = $("#interne").offset().top;
		var heightDiv = $("#scroll_vertical").height();
		var heightTxt = $("#interne").height();
		var differenceTailleInitial = parseInt(heightTxt) - parseInt(heightDiv);
	
		$("#scroll_top").mouseover(
			function(){
					
				if(heightTxt > heightDiv)
				{
					var top2 = $("#interne").offset().top;
					var differenceTaille = parseInt(top1) - parseInt(top2);
								
					if(differenceTaille != 0)
						$("#interne").animate({"top": "+="+differenceTaille+"px"}, 3000);
				}
			}
		);
		$("#scroll_top").mouseout(
			function() {
				$("#interne").stop();
			}
		);
		
		$("#scroll_bas").mouseover(
			function() {
				var top2 = $("#interne").offset().top;
				var differenceTaille = parseInt(top1) - parseInt(top2);
				
				if(heightTxt > heightDiv)
				{
					var top2 = $("#interne").offset().top;
					var differenceTaille = parseInt(top1) - parseInt(top2);
				
					if(parseInt(top1) == parseInt(top2))
						$("#interne").animate({"top": "-="+differenceTailleInitial+"px"}, 3000);
					else if( differenceTaille < differenceTailleInitial)
					{
						differenceTaille = differenceTailleInitial - differenceTaille;
						$("#interne").animate({"top": "-="+differenceTaille+"px"}, 3000);
					}
				}
			}
		);
		$("#scroll_bas").mouseout(
			function() {
				$("#interne").stop();			
			}	
		);
		
	}
	
});