// JavaScript Document

function opacity(id, opacStart, opacEnd, millisec) {
    //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));
            timer++;
        }
    } else if(opacStart < opacEnd) {
        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 + ")";
} 

function shiftOpacity(id) {
	
	  //speed for each frame
		var millisec = 1000;
    var speed = Math.round(millisec / 100);
    var timer = 0;
		var object = document.getElementById(id).style;
    //if an element is visible, make it invisible, else make it visible
    if(object.opacity == 1 && object.display == 'block') {
			  opacity(id, 100, 0, millisec); //fade out
 				setTimeout( "document.getElementById('loginbar').style.display = 'none'", millisec); //then hide div block
    } 
		else {
			object.display = 'block'; //show div block but..
			object.opacity = 0; //set invisible(opacity 0) first then..
			object.filter = 'alpha(opacity="0")'; //sets opacity to 0 for IE browsers. 
			opacity(id, 0, 100, millisec); //..gradually fade in
    }
}