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, maxopac, millisec) {
    //if an element is invisible, make it visible, else make it ivisible
    if(document.getElementById(id).style.opacity == 0) {
        opacity(id, 0, maxopac, millisec);
    } else {
        opacity(id, maxopac, 0, millisec);
    }
}

function raiseOpacity(id, maxopac, millisec) {
    //if an element is invisible, make it visible, else make it ivisible
            opacity(id, 0, maxopac, millisec);
    
    
} 

function vanishOpacity(id, maxopac, millisec) {
    //if an element is invisible, make it visible, else make it ivisible
   
        opacity(id, maxopac, 0, millisec);
    
}  

function slideInfoImage(idName){
	
	var sourceName = document.getElementById(idName).id;
	var sourceId = sourceName.substr((sourceName.length-1),1);
	//alert (sourceId);
		document.getElementById('ImageSlSh'+ sourceId).style.background="blue";
	document.getElementById('infoImageSlSh'+ sourceId).style.textDecoration="underline";
	document.getElementById('infoImageSlSh'+ sourceId).style.color="blue";
	document.getElementById('infoinblack'+ sourceId).style.color="white";
	document.getElementById('infoinblack'+ sourceId).style.fontSize="14pt";
		

}

function clearSlideInfoImage(idName){
	var sourceName = document.getElementById(idName).id;
	var sourceId = sourceName.substr((sourceName.length-1),1);
	//alert (sourceId);
		document.getElementById('ImageSlSh'+ sourceId).style.background="none";
	document.getElementById('infoImageSlSh'+ sourceId).style.textDecoration="none";
}

function changeBackground (idName){
	document.getElementById(idName).style.bgcolor="grey";
	
}