function portfolio_menu_color(id) {
	document.getElementById('asc').style.top = "0px";
	document.getElementById('home_textarea_texte').style.top = "0px";
	if (id == "sous_menu1") { 
		document.getElementById('sous_menu1').src = "Image/btn_portfolio_logotype_sel.png"; 
		connectURL('sous_menu1');
	}
	else { 
		document.getElementById('sous_menu1').src = "Image/btn_portfolio_logotype.png";
	}
	
	if (id == "sous_menu2") { 
		document.getElementById('sous_menu2').src = "Image/btn_portfolio_print_sel.png"; 
		connectURL('sous_menu2');
	} 
	else { 
		document.getElementById('sous_menu2').src = "Image/btn_portfolio_print.png";
	}
	
	if (id == "sous_menu3") { 
		document.getElementById('sous_menu3').src = "Image/btn_portfolio_web_sel.png"; 
		connectURL('sous_menu3');
	} 
	else { 
		document.getElementById('sous_menu3').src = "Image/btn_portfolio_web.png";
	}
	
	
	if (id == "sous_menu4") { 
		document.getElementById('sous_menu4').src = "Image/btn_portfolio_autre_sel.png"; 
		connectURL('sous_menu4');
	} 
	else { 
		document.getElementById('sous_menu4').src = "Image/btn_portfolio_autre.png";
	}
	hauteur = (document.getElementById('home_textarea_texte').offsetHeight-240)
}

// La fonction qui fait défiler le menu vers la gauche
function SL(texte) {
	a=document.getElementById(texte);
	if ( Math.abs((parseInt(a.style.left)-88) / 386 ) + 2 < document.getElementById("portfolio_sous_cadre").getElementsByTagName('img').length ) {
		a.style.left=a.offsetLeft-386 + "px";
	}
	else {
		a.style.left = "-298px";
	}
	//alert(document.getElementById("portfolio_sous_cadre").getElementsByTagName('img').length);
	

}

// La fonction qui fait défiler le menu vers la droite
function SR(texte) {
	a=document.getElementById(texte);
	if (parseInt(a.style.left) < -298 ) {
		a.style.left=a.offsetLeft + 386 + "px";
	}
	else {
		a.style.left = "-" + ((document.getElementById("portfolio_sous_cadre").getElementsByTagName('img').length - 3 ) * 386  + 298 ) + "px";
	}
}

//Mise à jour du thème des photos
function connectURL(section) {
	var url = 'maj_portfolio.php';
	var pars = 'param1='+section;
	var target = 'home_textarea_texte';
	var myAjax = new Ajax.Updater(target, url, {method: 'get', parameters: pars});
} 

function handle(delta) {
	var Y = parseInt(document.getElementById('asc').style.top);
	if(isNaN(Y)) 
		Y=0;

        if (delta < 0) {
			if (Y+5 >221) {
				document.getElementById('asc').style.top = "221px";
			}
			else document.getElementById('asc').style.top = (Y + 20) + "px";
			hauteur = (document.getElementById('home_textarea_texte').offsetHeight-240);
			document.getElementById('home_textarea_texte').style.top = "-" + parseInt(Y*hauteur/221) + "px";

		}
        else {
			if (Y-5 <0) {
				document.getElementById('asc').style.top = "0px";
			}
			else document.getElementById('asc').style.top = (Y - 20) + "px";
			hauteur = (document.getElementById('home_textarea_texte').offsetHeight-240);
			document.getElementById('home_textarea_texte').style.top = "-" + parseInt(Y*hauteur/221) + "px";
		}
}

/** Event handler for mouse wheel event.
 */
function wheel(event){
        var delta = 0;
        if (!event) /* For IE. */
                event = window.event;
        if (event.wheelDelta) { /* IE/Opera. */
                delta = event.wheelDelta/120;
                /** In Opera 9, delta differs in sign as compared to IE.
                 */
                if (window.opera)
                        delta = -delta;
        } else if (event.detail) { /** Mozilla case. */
                /** In Mozilla, sign of delta is different than in IE.
                 * Also, delta is multiple of 3.
                 */
                delta = -event.detail/3;
        }
        /** If delta is nonzero, handle it.
         * Basically, delta is now positive if wheel was scrolled up,
         * and negative, if wheel was scrolled down.
         */
        if (delta)
                handle(delta);
        /** Prevent default actions caused by mouse wheel.
         * That might be ugly, but we handle scrolls somehow
         * anyway, so don't bother here..
         */
        if (event.preventDefault)
                event.preventDefault();
	event.returnValue = false;
}

/** Initialization code. 
 * If you use your own event management code, change it as required.
 */
function init() {
	var Obj = document.getElementById('home_textarea');
	if (Obj.addEventListener)
			/** DOMMouseScroll is for mozilla. */
			Obj.addEventListener('DOMMouseScroll', wheel, false);
	/** IE/Opera. */
	Obj.onmousewheel = Obj.onmousewheel = wheel;
}