function getEventObject(W3CEvent) {	
	return W3CEvent || window.event;
}
function getPointerPosition(e) {			
	e = e || getEventObject(e);
	var x = e.pageX || (e.clientX + (document.documentElement.scrollLeft || document.body.scrollLeft));
	var y = e.pageY || (e.clientY + (document.documentElement.scrollTop || document.body.scrollTop));
	
	return { 'x':x,'y':y };
}
function setOpacity(elem,level) {			
	if(elem.filters) {
		elem.style.filter = 'alpha(opacity=' + level * 100 + ')';
	} else {
		elem.style.opacity = level;
	}
}
function css(elem,prop) {			
	for(var i in prop) {
		if(i == 'opacity') {
			setOpacity(elem,prop[i]);
		} else {
			elem.style[i] = prop[i];
		}
	}
	return elem;
}
var magnifier = {
	m : null,
	
	init:function(magni){
		var m = this.m = magni || {
			cont : null,		
			img : null,		
			mag : null,		
			scale : 15			
		}
		
		css(m.img,{	
			'position' : 'absolute',
			'width' : (m.cont.clientWidth * m.scale) + 'px',			
			'height' : (m.cont.clientHeight * m.scale) + 'px'				
			})
		
		css(m.mag,{
			'display' : 'none',
			'width' : m.cont.clientWidth + 'px',		
			'height' : m.cont.clientHeight + 'px',
			'position' : 'absolute',
			'left' : m.cont.offsetLeft + m.cont.offsetWidth + 2 + 'px',		
			'top' : m.cont.offsetTop + 'px'
			})
		
		var borderWid = m.cont.getElementsByTagName('div')[0].offsetWidth - m.cont.getElementsByTagName('div')[0].clientWidth;	
		
		css(m.cont.getElementsByTagName('div')[0],{			
			'display' : 'none',					
			'width' : m.cont.clientWidth / m.scale - borderWid + 'px',		
			'height' : m.cont.clientHeight / m.scale - borderWid + 'px',	
			'opacity' : 0.5		
			})
		
		m.img.src = m.cont.getElementsByTagName('img')[0].src;		
		m.cont.style.cursor = 'crosshair';
		
		m.cont.onmouseover = magnifier.start;
		
	},
	
	start:function(e){
		
		if(document.all){		
			magnifier.createIframe(magnifier.m.img);
		}
		
		this.onmousemove = magnifier.move;	
		this.onmouseout = magnifier.end;
	},
	
	move:function(e){
		var pos = getPointerPosition(e);	
		
		this.getElementsByTagName('div')[0].style.display = '';
		
		css(this.getElementsByTagName('div')[0],{
			'top' : Math.min(Math.max(pos.y - this.offsetTop - parseInt(this.getElementsByTagName('div')[0].style.height) / 2,0),this.clientHeight - this.getElementsByTagName('div')[0].offsetHeight) + 'px',
			'left' : Math.min(Math.max(pos.x - this.offsetLeft - parseInt(this.getElementsByTagName('div')[0].style.width) / 2,0),this.clientWidth - this.getElementsByTagName('div')[0].offsetWidth) + 'px'		
			})
		
		magnifier.m.mag.style.display = '';
		
		css(magnifier.m.img,{
			'top' : - (parseInt(this.getElementsByTagName('div')[0].style.top) * magnifier.m.scale) + 'px',
			'left' : - (parseInt(this.getElementsByTagName('div')[0].style.left) * magnifier.m.scale) + 'px'
			})
		
	},
	
	end:function(e){
		this.getElementsByTagName('div')[0].style.display = 'none';
		magnifier.removeIframe(magnifier.m.img);		
		
		magnifier.m.mag.style.display = 'none';
	},
	
	createIframe:function(elem){
		var layer = document.createElement('iframe');
		layer.tabIndex = '-1';
		layer.src = 'javascript:false;';
		elem.parentNode.appendChild(layer);
		
		layer.style.width = elem.offsetWidth + 'px';
		layer.style.height = elem.offsetHeight + 'px';
	},
	
	removeIframe:function(elem){
		var layers = elem.parentNode.getElementsByTagName('iframe');
		while(layers.length >0){
			layers[0].parentNode.removeChild(layers[0]);
		}
	}
}
window.onload = function(){
if(document.getElementById('magnifier')){
	magnifier.init({
				   cont : document.getElementById('magnifier'),
				   img : document.getElementById('magnifierImg'),
				   mag : document.getElementById('mag'),
				   scale : 3
				   });
	initMenu();
	}
}