/**
 * @author Alexandre Magno
 * @desc Center a element with jQuery
 * @version 1.0
 * @example
 * $("element").center({
 *
 * 		vertical: true,
 *      horizontal: true
 *
 * });
 * @obs With no arguments, the default is above
 * @license free
 * @param bool vertical, bool horizontal
 * @contribution Paulo Radichi
 *
 */
jQuery.fn.center=function(params){
		var options={vertical:true,horizontal:true}
		op=jQuery.extend(options,params);
		return this.each(function(){
			var $self=jQuery(this);
			var width=$self.width();
			var height=$self.height();
			var paddingTop=parseInt($self.css("padding-top"));
			var paddingBottom=parseInt($self.css("padding-bottom"));
			var borderTop=parseInt($self.css("border-top-width"));
			var borderBottom=parseInt($self.css("border-bottom-width"));
			var mediaBorder=(borderTop+borderBottom)/2;
			var mediaPadding=(paddingTop+paddingBottom)/2;
			var positionType=$self.parent().css("position");
			var halfWidth=(width/2)*(-1);
			var halfHeight=((height/2)*(-1))-mediaPadding-mediaBorder;
			var cssProp={position:'absolute'};
			if(op.vertical){
				cssProp.height=height;
				cssProp.top='50%';
				cssProp.marginTop=halfHeight
			}
			if(op.horizontal){
				cssProp.width=width;cssProp.left='50%';
				cssProp.marginLeft=halfWidth
			}
			if(positionType=='static'){
				$self.parent().css("position","relative")
			}
			$self.css(cssProp)
		}
	);
};