function opacity(id, opacStart, opacEnd, millisec) {
	if (UserNeedsABetterBrowser()) {
		return false;
	}
	
	var i;
	
    //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++;
        }
    }
}

function UserNeedsABetterBrowser() {
    return navigator.appName == "Microsoft Internet Explorer";
}

//change the opacity for different browsers
function changeOpac(opacity, id) {
	if (UserNeedsABetterBrowser()) {
		return false;
	}
	
    var object = document.getElementById(id).style;
	if (opacity >= 100) {
		object.opacity = '';
		object.MozOpacity = '';
		object.KhtmlOpacity = '';
		object.filter = '';
	} else {
	    object.opacity = (opacity / 100);
	    object.MozOpacity = (opacity / 100);
	    object.KhtmlOpacity = (opacity / 100);
		
		if (parseFloat(navigator.appVersion.split("MSIE")[1]) < 7) {
			object.filter = "alpha(opacity=" + opacity + ")";
		}
	}
}
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)
}