function getPageScroll(){
	var yScroll;

	if (self.pageYOffset) {
		yScroll = self.pageYOffset;
	} else if (document.documentElement && document.documentElement.scrollTop){	 // Explorer 6 Strict
		yScroll = document.documentElement.scrollTop;
	} else if (document.body) {// all other Explorers
		yScroll = document.body.scrollTop;
	}

	arrayPageScroll = new Array('',yScroll) 
	return arrayPageScroll;
}
function getPageSize(){
	var xScroll, yScroll;
	
	if (window.innerHeight && window.scrollMaxY) {	
		xScroll = document.body.scrollWidth;
		yScroll = window.innerHeight + window.scrollMaxY;
	} else if (document.body.scrollHeight > document.body.offsetHeight){ // all but Explorer Mac
		xScroll = document.body.scrollWidth;
		yScroll = document.body.scrollHeight;
	} else { // Explorer Mac...would also work in Explorer 6 Strict, Mozilla and Safari
		xScroll = document.body.offsetWidth;
		yScroll = document.body.offsetHeight;
	}
	
	var windowWidth, windowHeight;
	if (self.innerHeight) {	// all except Explorer
		windowWidth = self.innerWidth;
		windowHeight = self.innerHeight;
	} else if (document.documentElement && document.documentElement.clientHeight) { // Explorer 6 Strict Mode
		windowWidth = document.documentElement.clientWidth;
		windowHeight = document.documentElement.clientHeight;
	} else if (document.body) { // other Explorers
		windowWidth = document.body.clientWidth;
		windowHeight = document.body.clientHeight;
	}	
	
	// for small pages with total height less then height of the viewport
	if(yScroll < windowHeight){
		pageHeight = windowHeight;
	} else { 
		pageHeight = yScroll;
	}

	// for small pages with total width less then width of the viewport
	if(xScroll < windowWidth){	
		pageWidth = windowWidth;
	} else {
		pageWidth = xScroll;
	}


	arrayPageSize = new Array(pageWidth,pageHeight,windowWidth,windowHeight) 
	return arrayPageSize;
}
function vensterlaaginstellen(hoogte){
	var objvensterlaag = document.getElementById('vensterlaag');
	objvensterlaag.style.height = (hoogte + 'px');
	objvensterlaag.style.display = 'none';
	objvensterlaag.onclick = function () { hidevenster(); return false;}
}

function venstermaken(breedte,hoogte){
	var arrayPageSize = getPageSize();
	var arrayPageScroll = getPageScroll();

	gegevensbladheight = hoogte - 70;
	gegevensbladwidth = breedte - 20;
		
	vensterlaaginstellen(arrayPageSize[1]);
		
	vensterhtml = '<div id="venstertitelbalk"><div class="cel4 b20">&nbsp;</div><div class="cel4" id="venstertitel"></div><div class="rechts b20 ho20 tc mr5 lichtblauw border2"><a class="wit vet nietstreep" href="javascript:void(0);" onclick="javascript:hidevenster();" title="afsluiten">x</a></div></div><div class="cel3 m10" id="gegevensblad"></div><div id="vensterbodem" class="rechts ho20 mr5"></div>';

	var objvenster = document.getElementById('venster');
	objvenster.style.height = hoogte + "px";
	objvenster.style.width = breedte + "px";
	var vensterTop = arrayPageScroll[1] + ((arrayPageSize[3] - hoogte) / 2) ;
	var vensterLeft = ((arrayPageSize[0] - breedte) / 2);
	objvenster.style.top = (vensterTop < 0) ? "0px" : vensterTop + "px";
	objvenster.style.left = (vensterLeft < 0) ? "0px" : vensterLeft + "px";
	objvenster.style.display = 'none';
	objvenster.innerHTML = vensterhtml;
	
	var objgegevensblad = document.getElementById('gegevensblad');
	objgegevensblad.style.height = gegevensbladheight + "px";
	objgegevensblad.style.width = gegevensbladwidth + "px";
}
function showvenster(titel,bodem,breedte,hoogte){
	venstermaken(breedte,hoogte);
	pagina_laden();
	
	var objvensterlaag = document.getElementById('vensterlaag');
	var objvenster = document.getElementById('venster');
	var venstertitel = document.getElementById('venstertitel');
	var vensterbodem = document.getElementById('vensterbodem');
	
	objvensterlaag.style.display = 'block';
	objvenster.style.display = 'block';
	
	venstertitel.innerHTML = titel;
	vensterbodem.innerHTML = bodem;
}
function meldingmaken(breedte,hoogte,type){
	var arrayPageSize = getPageSize();
	var arrayPageScroll = getPageScroll();

	gegevensbladheight = hoogte;
	gegevensbladwidth = breedte - 15;
	var objvenster = document.getElementById('meldingsvenster');
	if(type==1){ //algemene melding
		objvenster.style.backgroundColor = '#eee';
		objvenster.style.border = '#990000 solid 2px';
	}
	if(type==2){ //goedmelding
		objvenster.style.backgroundColor = '#9DEA99';
		objvenster.style.border = '#006600 solid 2px';
	}
	if(type==3){ //foutmelding
		objvenster.style.backgroundColor = '#EAB4A2';
		objvenster.style.border = '#990000 solid 2px';
	}
	vensterhtml = '<div id="gegevensblad" class="cel3 m10"></div>';
	
	objvenster.style.height = hoogte + "px";
	objvenster.style.width = breedte + "px";
	var vensterTop = arrayPageScroll[1] + ((arrayPageSize[3] - hoogte) / 2) ;
	var vensterLeft = ((arrayPageSize[0] - breedte) / 2);
	objvenster.style.top = (vensterTop < 0) ? "0px" : vensterTop + "px";
	objvenster.style.left = (vensterLeft < 0) ? "0px" : vensterLeft + "px";
	objvenster.style.display = 'none';
	objvenster.innerHTML = vensterhtml;
	
	var objgegevensblad = document.getElementById('gegevensblad');
	objgegevensblad.style.height = gegevensbladheight + "px";
	objgegevensblad.style.width = gegevensbladwidth + "px";
}
function showmelding(breedte,hoogte,melding,msg){
	var type = meldingen[melding]['type'];
	meldingmaken(breedte,hoogte,type);
	pagina_melding(melding,msg);
	
	var objvenster = document.getElementById('meldingsvenster');
	objvenster.style.display = 'block';
}

function hidevenster()
{
	objvensterlaag = document.getElementById('vensterlaag');
	objvenster = document.getElementById('venster');

	objvensterlaag.style.display = 'none';
	objvenster.style.display = 'none';

	objvenster.innerHTML = '';

	document.onkeypress = '';
}
function hidemelding()
{
	objvenster = document.getElementById('meldingsvenster');
	objvenster.style.display = 'none';

	objvenster.innerHTML = '';
	document.onkeypress = '';
}
function pagina_laden()
{
	html = '<div class="cel3 tc fo14 i1" ><img src="im/ajax-loading.gif" alt="loading" class="i1" /> Gegevens worden geladen...<br /><br />'+
				'<span class="bordeau"><a class="bordeau" href="javascript:hidevenster();">Annuleren</a></span>'+
					'</div>';
					
	objvenster = document.getElementById('gegevensblad');
	
	objvenster.innerHTML = html;
}
function pagina_melding(melding,msg){
	html = '<div class="cel3"><div class="rechts"><a class="bordeau" href="javascript:hidemelding();"><img src="im/sym/sluit.png"  /></a></div><div class="cel4 b40 ho60 fo11 i1" ><img src="im/sym/' + meldingen[melding]['icon'] + '" alt="melding" class="i1" /></div>' +
		'' + meldingen[melding]['text'] + '' + msg + '</div>';			
	objvenster = document.getElementById('gegevensblad');
	
	objvenster.innerHTML = html;
}