function StartImg(img){	
	if(flow > 0){
		javascript:opacity('slideblock', 100, 0, 100)
		setTimeout("ShowImg('"+img+"')", 200);
		flow = 0;
	}
}
flow = 100;

function ShowImg(img){
	var project = document.getElementById('slideblock');
	project.innerHTML = "<img src=\""+img+"\" style=\"margin-top:13px\" alt=\"\" />";
	opacity('slideblock', 0, 100, 100)
	setTimeout("Overflow()", 200);
}

function Overflow(){
	flow = 100;
}

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 + ")";
}