$.fn['place']=function(opt){
	var opt=$.extend({position:'fixed',zindex:'9999',place:'c'},opt||{})
	if(parseInt($.browser.version)<7&&$.browser.msie)opt.position='absolute'
	// tl
	var left=0
	var top=0
	switch(opt.place){
		case 'bl':
		top=parseInt($(window).height()-this.outerHeight({margin:true}))
		break
		case 'tr':
		left=parseInt($(window).width()-this.outerWidth({margin:true}))
		break
		case 'br':
		left=parseInt($(window).width()-this.outerWidth({margin:true}))
		top=parseInt($(window).height()-this.outerHeight({margin:true}))
		break
		case 'tc':
		left=parseInt(($(window).width()-this.outerWidth({margin:true}))/2)
		break
		case 'bc':
		left=parseInt(($(window).width()-this.outerWidth({margin:true}))/2)
		top=parseInt($(window).height()-this.outerHeight({margin:true}))
		break
		case 'c':
		left=parseInt(($(window).width()-this.outerWidth({margin:true}))/2)
		top=parseInt(($(window).height()-this.outerHeight({margin:true}))/2)
		break
	}
	this.css({'position':opt.position,'z-index':opt.zindex,'left':left,'top':top})
}