function opacitymove(id, opacStart, opacEnd, millisec, retrazo, xstart, ystart, xend, yend, chekpag, indiceesteti) {
	//speed for each frame
	var speed = Math.round(millisec / 100);
	var timer = 0;

	//determine the direction for the blending, if start and end are the same nothing happens
	if(opacStart > opacEnd) {
		for(i = opacStart; i >= opacEnd; i--) {
			posx = xstart+((xend-xstart)/100)*i;
			posy = ystart+((yend-ystart)/100)*i;
			setTimeout("changeOpacMove(" + i + ",'" + id + "', " + posx + ", " + posy + ", '" + chekpag + "', " + indiceesteti + ")",(timer * speed + retrazo));
			timer++;
		}
		setTimeout("fintrans('" + id + "')",(timer * speed + retrazo));
	} else if(opacStart < opacEnd) {
		setTimeout("initrans('" + id + "')",(timer * speed + retrazo));
		for(i = opacStart; i <= opacEnd; i++)
			{
			posx = xstart+((xend-xstart)/100)*i;
			posy = ystart+((yend-ystart)/100)*i;
			setTimeout("changeOpacMove(" + i + ",'" + id + "', " + posx + ", " + posy + ", '" + chekpag + "', " + indiceesteti + ")",(timer * speed + retrazo));
			timer++;
		}
	}
}

//change the opacity for different browsers
function changeOpacMove(opacity, id, posx, posy, chekpag, indiceesteti) {
//	if (pagactual==chekpag && esteticausu[indiceesteti]==1) {
		var object = document.getElementById(id).style; 
		object.opacity = (opacity / 100);
		object.MozOpacity = (opacity / 100);
		object.KhtmlOpacity = (opacity / 100);
		object.filter = "alpha(opacity=" + opacity + ")";
		object.top = String(posy)+"px";
//		object.left = String(posx)+"px";
//	}
}

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

	//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 + retrazo));
			timer++;
		}
		setTimeout("fintrans('" + id + "')",(timer * speed + retrazo));
	} else if(opacStart < opacEnd) {
		setTimeout("initrans('" + id + "')",(timer * speed + retrazo));
		for(i = opacStart; i <= opacEnd; i++)
			{
			setTimeout("changeOpac(" + i + ",'" + id + "')",(timer * speed + retrazo));
			timer++;
		}
	}
}

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

	//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 + retrazo));
			timer++;
		}
	} else if(opacStart < opacEnd) {
		for(i = opacStart; i <= opacEnd; i++)
			{
			setTimeout("changeOpac(" + i + ",'" + id + "')",(timer * speed + retrazo));
			timer++;
		}
	}
}

//pone el elemento pasado por id en visibilidad oculta
function fintrans(id) {
	document.getElementById(id).style.visibility = "hidden";
}

//pone el elemento pasado por id en visibilidad visible
function initrans(id) {
	document.getElementById(id).style.visibility = "visible";
}

//pone el elemento pasado por id en transparencia 100
function initransb(id) {
	var object = document.getElementById(id).style; 
	object.opacity = 100;
	object.MozOpacity = 100;
	object.KhtmlOpacity = 100;
	object.filter = "alpha(opacity=" + 100 + ")";
}

//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 + ")";
}

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)
}