/*******************************
		Control d'Opacitat        
 *******************************/

	function opacity(id, opacStart, opacEnd, millisec) {
	    //speed for each frame
	    var speed = Math.round(millisec / 100);
	    var timer = 0;

		//<MEU
        if (opacStart <= -1) opacStart = obtenirOpac(id);
		//>MEU

	    //determine the direction for the blending, if start and end are the same nothing happens
	    if(opacStart > opacEnd) {
	        for(i = opacStart; i >= opacEnd; i--) {
	            setTimeout("changeOpac(" + i + ",\'" + id + "\')",(timer * speed));
	            timer++;
	        }
			//<MEU
            //document.getElementById(id).style.zIndex=0;

	    } else if(opacStart < opacEnd) {
			//<MEU
            //document.getElementById(id).style.display="block";
            //document.getElementById(id).style.zIndex=10;
	        for(i = opacStart; i <= opacEnd; i++)
	            {
	            setTimeout("changeOpac(" + i + ",\'" + id + "\')",(timer * speed));
	            timer++;
	        }
	    }
	}

	//change the opacity for different browsers
	function changeOpac(opacity, id) {
	    var object = document.getElementById(id).style;
	    object.opacity = (opacity / 100);
	    object.MozOpacity = (opacity / 100);
	    object.KhtmlOpacity = (opacity / 100);
	    object.filter = "alpha(opacity=" + opacity + ")";

		//<MEU
		//if (opacity=0) document.getElementById(id).style.display="none";
	}

	//MEVA, prova
	function obtenirOpac(id) {
	    var object = document.getElementById(id).style;
	    if (object.opacity)			  opac = object.opacity * 100;
	    else if (object.MozOpacity)   opac = object.MozOpacity  * 100;
		else if (object.KhtmlOpacity) opac = object.KhtmlOpacity * 100;

		return opac;
	}

	function shiftOpacity(id, millisec) {
	    //if an element is invisible, make it visible, else make it ivisible
	    if(document.getElementById(id).style.opacity == 0) {
	        opacity(id, 0, 100, millisec);
	    } else {
	        opacity(id, 100, 0, millisec);
	    }
	}

	function blendimage(divid, imageid, imagefile, millisec) {
	    var speed = Math.round(millisec / 100);
	    var timer = 0;

	    //set the current image as background
	    document.getElementById(divid).style.backgroundImage = "url(" + document.getElementById(imageid).src + ")";

	    //make image transparent
	    changeOpac(0, imageid);

	    //make new image
	    document.getElementById(imageid).src = imagefile;

	    //fade in image
	    for(i = 0; i <= 100; i++) {
	        setTimeout("changeOpac(" + i + ",\'" + imageid + "\')",(timer * speed));
	        timer++;
	    }
	}

	function currentOpac(id, opacEnd, millisec) {
	    //standard opacity is 100
	    var currentOpac = 100;

	    //if the element has an opacity set, get it
	    if(document.getElementById(id).style.opacity < 100) {
	        currentOpac = document.getElementById(id).style.opacity * 100;
	    }

	    //call for the function that changes the opacity
	    opacity(id, currentOpac, opacEnd, millisec)
	}