Element.extend({bgiframe:function(styles){if(window.ie6){if(!this.getElement('iframe.bgiframe')){styles=styles||{};var ifsrc=$pick(styles.src,'javascript:false');delete styles.src;var ifopac=$pick(styles.opacity,true);delete styles.opacity;(new Element('iframe',{'class':'bgiframe',frameborder:0,tabindex:-1,src:ifsrc,styles:$merge({top:-this.getStyle('borderTopWidth').toInt(),left:-this.getStyle('borderLeftWidth').toInt(),width:this.offsetWidth,height:this.offsetHeight},styles,{display:'block',position:'absolute',zIndex:-1,filter:ifopac?"Alpha(Opacity='0')":''})})).injectBefore(this.firstChild)}}return this}});