function zoomIn()
		{
			var _all = window.document.getElementsByTagName('*');
			var _num = _all.length;
			
			for(var i=0; i<_num; i++)
			{
				_cSize = getStyle(_all[i], 'font-size').match(/^([+-]?(?:\d+|\d*\.\d+))([a-z]*|%)$/);
				
				if(_cSize)        
				{                 
					_all[i].style.fontSize = (parseFloat(_cSize[1])+1)+_cSize[2];
				}
			}
		}
		function zoomOut()
		{
			var _all = window.document.getElementsByTagName('*');
			var _num = _all.length;
			
			for(var i=0; i<_num; i++)
			{
				var _cSize = parseInt(getStyle(_all[i], 'font-size').replace("px", ""));
				
				if(_cSize)                 
					_all[i].style.fontSize = _cSize-1+'px';
			}
		}
		
	function getStyle(el,styleProp)
	{
		var x = el;
		if (x.currentStyle)
		{                  
			var _i = styleProp.indexOf('-');
			styleProp = styleProp.replace(/\-./, styleProp[_i+1].toUpperCase());
			
			var y = x.currentStyle[styleProp];
		}
		else if (window.getComputedStyle)
			var y = document.defaultView.getComputedStyle(x,null).getPropertyValue(styleProp);
		return y;
	}