function pass_comment(adId,cityName){
	document.getElementById('adBody').innerHTML ="<IFRAME SRC='../marketplace-city/show_ad_new.php?ad_id="+adId+"&cityName="+cityName+"' width='100%' height='100%' frameborder='0' scrolling='no' id='frmDetail'></IFRAME>" ; 
	var scrolledX, scrolledY;
	if( self.pageYOffset ) {
		scrolledX = self.pageXOffset;
		scrolledY = self.pageYOffset;
	} else if( document.documentElement && document.documentElement.scrollTop ) {
		scrolledX = document.documentElement.scrollLeft;
		scrolledY = document.documentElement.scrollTop;
	} else if( document.body ) {
		scrolledX = document.body.scrollLeft;
		scrolledY = document.body.scrollTop;
	}
	
	var centerX, centerY;
	if( self.innerHeight ) {
		centerX = self.innerWidth;
		centerY = self.innerHeight;
	} else if( document.documentElement && document.documentElement.clientHeight ) {
		centerX = document.documentElement.clientWidth;
		centerY = document.documentElement.clientHeight;
	} else if( document.body ) {
		centerX = document.body.clientWidth;
		centerY = document.body.clientHeight;
	}
	
	var leftOffset = scrolledX + (centerX - 600) / 2;
	var topOffset = scrolledY + (centerY - 600) / 2;
	var o=document.getElementById('showAd');
	var r=o.style;
	r.position='absolute';
	r.top = topOffset + 'px';
	r.left = leftOffset + 'px';
	r.display = "block";
}