// JavaScript Document

var ie;
if (navigator.appName=="Microsoft Internet Explorer")
	ie = true;
else
	ie = false;

/* crossbrowser style-setter */
function setStyle(object, newstyle) {
	if (ie)
		object.style.setAttribute('cssText', newstyle, 0);
	else
		object.setAttribute("style", newstyle);
}

/* crossbrowser style-getter */
function getStyle(object) {
	if (ie) {
		if (object.style.getAttribute('cssText'))
			return object.style.getAttribute('cssText');
		else
			return null;
	}
	else
		return object.getAttribute("style");
}

/* crossbrowser class-setter */
function setClass(object, newclass) {
	if (ie)
		object.setAttribute("className", newclass);
	else
		object.setAttribute("class", newclass);
}

/* set focus to an html input field */
function setFocus(field_id) {
	document.getElementById(field_id).focus();
}

/**
 * textarea auto resizer 
 * requires: prototype.js
 */
var textareaAutoSize = function (elementID) {
	if (! parseInt($(elementID).style.height) || $(elementID).scrollHeight > parseInt($(elementID).style.height)) {
		var newheight = Math.min($(elementID).scrollHeight, document.documentElement.clientHeight/3);
		
		var newheight_px = newheight+75+"px";
		Element.setStyle(elementID, {'height': newheight_px });
		
		if (newheight >= 500)
			Element.setStyle(elementID, {'overflow': 'auto'});
	}
}




/**
 * Cross-browser BlendTrans Filter JavaScript
 * fade opacity stuff: http://brainerror.net/scripts/javascript/blendtrans/
 */
	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, 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)
	}