fadetype=0;

function shiftOpacityIn(id, millisec, startpos, endpos) {
	fadetype=1;
    //if an element is invisible, make it visible, else make it ivisible
    if(document.getElementById(id).style.visibility!="visible") {
		document.getElementById(id).style.visibility="visible";
        opacity(id, startpos, endpos, millisec);
    } 
	else {
		opacity(id, startpos, endpos, millisec);
        //opacity(id, 100, 0, millisec);
    }
}

function shiftOpacityOut(id, millisec, endpos, page) {
	fadetype=2;
    //if an element is invisible, make it visible, else make it ivisible
	
    opacity(id, 100, endpos, millisec, page);
	/*if (endpos==0) {
		document.getElementById(id).style.visibility="hidden";
	}*/
} 

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

//change the opacity for different browsers
function changeOpac(opacity, id, page) {
	//alert(page);
    var object = document.getElementById(id).style;
    object.opacity = (opacity / 100);
    object.MozOpacity = (opacity / 100);
    object.KhtmlOpacity = (opacity / 100);
    object.filter = "alpha(opacity=" + opacity + ")";
	if (opacity<3 && fadetype==2) {
		loadPage(page, id);
		fadetype=0;
	}
}