/*
Opacity
*/

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++;
		}
	}
}

function fade_in_out(id, millisec) {
	//speed for each frame
	var speed = Math.round(millisec / 100);
	var timer = 0;
	
	for(i = 100; i >= 10; i--) {
		setTimeout("changeOpac(" + i + ",'" + id + "')",(timer * speed));
		timer++;
	}
	
	for(i = 10; i <= 100; i++) {
		setTimeout("changeOpac(" + i + ",'" + id + "')",(timer * speed));
		timer++;
	}
}

function fade_in(id, millisec, startpoint) {
	//speed for each frame
	var speed = Math.round(millisec / 100);
	var timer = 0;
	
	for(i = startpoint; i <= 100; i++) {
		setTimeout("changeOpac(" + i + ",'" + id + "')",(timer * speed));
		timer++;
	}
}

function fade_out(id, millisec, startpoint) {
	//speed for each frame
	var speed = Math.round(millisec / 100);
	var timer = 0;
	
	for(i = startpoint; i >= 0; 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 + ")";
}

// flicker
/*
function flicker(id, millisec) {

	if(document.getElementById(id).style.opacity == 100) {
		opacity(id, 100, 0, millisec);
		opacity(id, 0, 100, millisec);
		opacity(id, 100, 0, millisec);
		opacity(id, 0, 100, millisec);
	} else {
		opacity(id, 0, 100, millisec);
		opacity(id, 100, 0, millisec);
		opacity(id, 0, 100, millisec);
	}


}
*/

function shiftOpacity(id, millisec) {
	//if an element is invisible, make it visible, else make it ivisible
	if(document.getElementById(id).style.opacity == 0) {
		opacity(id, 0, 100, millisec);
	} else {
		opacity(id, 100, 0, millisec);
	}
}

function blendimage(divid, imageid, imagefile, millisec) {
	var speed = Math.round(millisec / 100);
	var timer = 0;
	
	//set the current image as background
	document.getElementById(divid).style.backgroundImage = "url(" + document.getElementById(imageid).src + ")";
	
	//make image transparent
	changeOpac(0, imageid);
	
	//make new image
	document.getElementById(imageid).src = imagefile;

	//fade in image
	for(i = 0; i <= 100; i++) {
		setTimeout("changeOpac(" + i + ",'" + imageid + "')",(timer * speed));
		timer++;
	}
}

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)
}


function changeVis(id, sVis) {
	var object = document.getElementById(id).style; 
	object.visibility = sVis;
}

function changeAnchorStyle(id, color, decoration) {
	var object = document.getElementById(id).style;
	/*var aobject = object.getElementsByTagName("a");*/
	object.color = color;
	object.textDecoration = decoration;
	/*
	document.styleSheets[0].cssRules[1].style.textDecoration = decoration;
	document.styleSheets[0].rules[1].style.textDecoration
	*/
}

function setCursorStyle(id, cursor) {
	var object = document.getElementById(id).style;
	// check for Safari
	if(navigator.appVersion.indexOf("Safari")==-1)
		object.cursor = cursor;
	else
		object.Cursor = cursor;
}

function setBorder(id, bwidth, bcolor, bstyle)
{
	var object = document.getElementById(id).style;
	object.borderWidth = bwidth;
	object.borderColor = bcolor;
	object.borderStyle = bstyle;
}

function setBorderWidth(id, bwidth) {
	var object = document.getElementById(id).style;
	object.border = bwidth;
}

function setColor(id, color) {
	var object = document.getElementById(id).style;
	object.color = color;
}