function opacity(id, opacStart, opacEnd, millisec) {
	//speed for each frame
	var speed = Math.round(millisec / 100);
	var timer = 0;
	
	changeOpac(opacStart,id);

	//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, 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 show(id) {
	var element = document.getElementById(id);
	element.style.display = "block";	
}

function hide(id) {
	var element = document.getElementById(id);
	element.style.display = "none";		
}

function hideElements(tag) {
	var objects = document.getElementsByTagName(tag);
	for(var x=0; x<objects.length; x++) {
		objects[x].style.display = "none";	
	}
	
}

function showElements(tag) {
	var objects = document.getElementsByTagName(tag);
	for(var x=0; x<objects.length; x++) {
		objects[x].style.display = "block";	
	}
	
}

function toggleCommentForm() {
	if(document.getElementById("C_Name").style.display == "none") {
		document.getElementById("C_Name").style.display = "inline";
		document.getElementById("C_Name_Label").style.display = "inline";
		document.getElementById("C_Email").style.display = "inline";
		document.getElementById("C_Email_Label").style.display = "inline";
		document.getElementById("Website").style.display = "inline";
		document.getElementById("Website_Label").style.display = "inline";
		document.getElementById("Comment").style.display = "inline";
		document.getElementById("Comment_Label").style.display = "inline";
		document.getElementById("SubmitButton").style.display = "block";
		document.getElementById("AddComment").style.height = "auto";
		document.getElementById("AddComment").style.border = "1px solid #333";
		document.getElementById("AddComment").style.paddingBottom = "";
		document.getElementById("AddComment").style.paddingTop = "";
		document.getElementById("AddComment").style.marginLeft = "";
		document.getElementById("EmailText").style.display = "inline";

	} else {
		document.getElementById("C_Name").style.display = "none";
		document.getElementById("C_Name_Label").style.display = "none";
		document.getElementById("C_Email").style.display = "none";
		document.getElementById("C_Email_Label").style.display = "none";
		document.getElementById("Website").style.display = "none";
		document.getElementById("Website_Label").style.display = "none";
		document.getElementById("Comment").style.display = "none";
		document.getElementById("Comment_Label").style.display = "none";			
		document.getElementById("SubmitButton").style.display = "none";	
		document.getElementById("AddComment").style.height = "0px";
		document.getElementById("AddComment").style.border = "none";
		document.getElementById("AddComment").style.paddingBottom = "0";
		document.getElementById("AddComment").style.paddingTop = "0";
		document.getElementById("AddComment").style.marginLeft = "3px";
		document.getElementById("EmailText").style.display = "none";
		
	}
}

/* give anchors with attribute rel="external" a target attribute of "_blank" */

function external() {
 if (document.getElementsByTagName) {
  var i, a;
  a = document.getElementsByTagName('a');
  for (i in a) {
  	if (a[i].nodeType === 1) {
		   if (a[i].getAttribute('href') && 
		       a[i].getAttribute('rel') == 'external') a[i].target = '_blank';
		  }
  }
 }
}

window.onload = external;