var ns4;
var op5;
var op6;
var agt;
var mac;
var ie; 
var mac_ie;

function sniffBrowsers() {
	ns4 = document.layers;
	op5 = (navigator.userAgent.indexOf("Opera 5")!=-1) ||(navigator.userAgent.indexOf("Opera/5")!=-1);
	op6 = (navigator.userAgent.indexOf("Opera 6")!=-1) ||(navigator.userAgent.indexOf("Opera/6")!=-1);
	agt=navigator.userAgent.toLowerCase();
	mac = (agt.indexOf("mac")!=-1);
	ie = (agt.indexOf("msie") != -1); 
	mac_ie = mac && ie;
}

function getStyleObject(objectId, doc) {
    if(document.getElementById && document.getElementById(objectId)) {
	return document.getElementById(objectId).style;
    } else if (document.all && document.all(objectId)) {
	return document.all(objectId).style;
    } else if (document.layers && document.layers[objectId]) {
		return getObjNN4(document,objectId);
    } else {
	return false;
    }
} 

function changeObjectVisibility(objectId, newVisibility) {
    var styleObject = getStyleObject(objectId, document);
    if(styleObject) {
	styleObject.visibility = newVisibility;
	return true;
    } else {
	return false;
    }
} 

function findImage(name, doc) {
	var i, img;
	for (i = 0; i < doc.images.length; i++) {
    	if (doc.images[i].name == name) {
			return doc.images[i];
		}
	}
	for (i = 0; i < doc.layers.length; i++) {
    	if ((img = findImage(name, doc.layers[i].document)) != null) {
			img.container = doc.layers[i];
			return img;
    	}
	}
	return null;
}

function getImage(name) {
	if (document.layers) {
    	return findImage(name, document);
	}
	return null;
}

function getObjNN4(obj,name)
{
	var x = obj.layers;
	var foundLayer;
	for (var i=0;i<x.length;i++)
	{
		if (x[i].id == name)
		 	foundLayer = x[i];
		else if (x[i].layers.length)
			var tmp = getObjNN4(x[i],name);
		if (tmp) foundLayer = tmp;
	}
	return foundLayer;
}

function getElementHeight(Elem) {
	if (ns4) {
		var elem = getObjNN4(document, Elem);
		return elem.clip.height;
	} else {
		var elem;
		if(document.getElementById) {
			var elem = document.getElementById(Elem);
		} else if (document.all){
			var elem = document.all[Elem];
		}
		if (op5) {
			xPos = elem.style.pixelHeight;
		} else {
			xPos = elem.offsetHeight;
		}
		return xPos;
	} 
}

function getElementWidth(Elem) {
	if (ns4) {
		var elem = getObjNN4(document, Elem);
		return elem.clip.width;
	} else {
		var elem;
		if(document.getElementById) {
			var elem = document.getElementById(Elem);
		} else if (document.all){
			var elem = document.all[Elem];
		}
		if (op5) {
			xPos = elem.style.pixelWidth;
		} else {
			xPos = elem.offsetWidth;
		}
		return xPos;
	}
}

function getElementLeft(Elem) {
	if (ns4) {
		var elem = getObjNN4(document, Elem);
		return elem.pageX;
	} else {
		var elem;
		if(document.getElementById) {
			var elem = document.getElementById(Elem);
		} else if (document.all){
			var elem = document.all[Elem];
		}
		xPos = elem.offsetLeft;
		tempEl = elem.offsetParent;
  		while (tempEl != null) {
  			xPos += tempEl.offsetLeft;
	  		tempEl = tempEl.offsetParent;
  		}
		return xPos;
	}
}


function getElementTop(Elem) {
	if (ns4) {
		var elem = getObjNN4(document, Elem);
		return elem.pageY;
	} else {
		if(document.getElementById) {	
			var elem = document.getElementById(Elem);
		} else if (document.all) {
			var elem = document.all[Elem];
		}
		yPos = elem.offsetTop;
		tempEl = elem.offsetParent;
		while (tempEl != null) {
  			yPos += tempEl.offsetTop;
	  		tempEl = tempEl.offsetParent;
  		}
		return yPos;
	}
}


function getImageLeft(myImage) {
	var x, obj;
	if (document.layers) {
		var img = getImage(myImage);
    	if (img.container != null)
			return img.container.pageX + img.x;
		else
			return img.x;
  	} else {
		return getElementLeft(myImage);
	}
	return -1;
}

function getImageTop(myImage) {
	var y, obj;
	if (document.layers) {
		var img = getImage(myImage);
		if (img.container != null)
			return img.container.pageY + img.y;
		else
			return img.y;
	} else {
		return getElementTop(myImage);
	}
	return -1;
}

function getImageWidth(myImage) {
	var x, obj;
	if (document.layers) {
		var img = getImage(myImage);
		return img.width;
	} else {
		return getElementWidth(myImage);
	}
	return -1;
}



function getImageHeight(myImage) {
	var y, obj;
	if (document.layers) {
		var img = getImage(myImage);
		return img.height;
	} else {
		return getElementHeight(myImage);
	}
	return -1;
}

function moveXY(myObject, x, y) {
	obj = getStyleObject(myObject)
	if (ns4) {
		obj.top = y;
 		obj.left = x;
	} else {
		if (op5) {
			obj.pixelTop = y;
 			obj.pixelLeft = x;
		} else {
			obj.top = y + 'px';
 			obj.left = x + 'px';
		}	
	}
}

function changeClass(Elem, myClass) {
	var elem;
	if(document.getElementById) {
		var elem = document.getElementById(Elem);
	} else if (document.all){
		var elem = document.all[Elem];
	}
	if (op5 || op6) elem.style.className = myClass;
	else elem.className = myClass;
}

function changeBGColour(myObject, colour) {
	if (ns4) {
		var obj = getObjNN4(document, myObject);
		obj.bgColor=colour;
	} else {
		var obj = getStyleObject(myObject);
		if (op5) {
			obj.background = colour;	
		} else {
			obj.backgroundColor = colour;
		}	
	}
}

function changeImage(target, source) {
	var imageObj;
	
	if (ns4) {
		imageObj = getImage(target);
		if (imageObj) imageObj.src = eval(source).src; 
	} else {
		imageObj = eval('document.images.' + target);
		if (imageObj) imageObj.src = eval(source).src; 
	}
}

Date.MONTHS = ['januari', 'februari', 'maart', 'april', 'mei', 'juni', 'juli',
  'augustus', 'september', 'oktober', 'november', 'december'];

Date.DAYS = ['zondag', 'maandag', 'dinsdag', 'woensdag', 'donderdag', 'vrijdag', 'zaterdag'];

Date.SUFFIXES = [
  'st','nd','rd','th','th','th','th','th','th','th',
  'th','th','th','th','th','th','th','th','th','th',
  'st','nd','rd','th','th','th','th','th','th','th',
  'st'
];

Date.prototype.format = function( mask ) {
  var formatted     = ( mask != null ) ? mask : 'DD-MMM-YY';
  var letters       = 'DMYHdhmst'.split( '' );
  var temp          = new Array();
  var count         = 0;
  var regexA;
  var regexB        = /\[(\d+)\]/;

  var day           = this.getDay();
  var date          = this.getDate();
  var month         = this.getMonth();
  var year          = this.getFullYear().toString();
  var hours         = this.getHours();
  var minutes       = this.getMinutes();
  var seconds       = this.getSeconds();

  var formats       = new Object();
  formats[ 'D' ]    = date;
  formats[ 'd' ]    = date + Date.SUFFIXES[ date - 1 ];
  formats[ 'DD' ]   = ( date < 10 ) ? '0' + date : date;
  formats[ 'DDD' ]  = Date.DAYS[ day ].substring( 0, 3 );
  formats[ 'DDDD' ] = Date.DAYS[ day ];
  formats[ 'M' ]    = month + 1;
  formats[ 'MM' ]   = ( month + 1 < 10 ) ? '0' + ( month + 1 ) : month + 1;
  formats[ 'MMM' ]  = Date.MONTHS[ month ].substring( 0, 3 );
  formats[ 'MMMM' ] = Date.MONTHS[ month ];
  formats[ 'Y' ]    = ( year.charAt( 2 ) == '0' ) ? year.charAt( 3 ) : year.substring( 2, 4 );
  formats[ 'YY' ]   = year.substring( 2, 4 );
  formats[ 'YYYY' ] = year;
  formats[ 'H' ]    = hours;
  formats[ 'HH' ]   = ( hours < 10 ) ? '0' + hours : hours;  
  formats[ 'h' ]    = ( hours > 12 || hours == 0 ) ? Math.abs( hours - 12 ) : hours;
  formats[ 'hh' ]   = ( formats[ 'h' ] < 10 ) ? '0' + formats[ 'h' ] : formats[ 'h' ];
  formats[ 'm' ]    = minutes;
  formats[ 'mm' ]   = ( minutes < 10 ) ? '0' + minutes : minutes;
  formats[ 's' ]    = seconds;
  formats[ 'ss' ]   = ( seconds < 10 ) ? '0' + seconds : seconds;
  formats[ 't' ]    = ( hours < 12 ) ?  'A' : 'P';
  formats[ 'tt' ]   = ( hours < 12 ) ?  'AM' : 'PM';

  for ( var i = 0; i < letters.length; i++ ) {
    regexA = new RegExp( '(' + letters[ i ] + '+)' );
    while ( regexA.test( formatted ) ) {
      temp[ count ] = RegExp.$1;
      formatted = formatted.replace( RegExp.$1, '[' + count + ']' );
      count++;
    }
  }

  while ( regexB.test( formatted ) ) {
    formatted = formatted.replace( regexB, formats[ temp[ RegExp.$1 ] ] );
  }

  return formatted;
}