var imagePreview = function(){	
		// these 2 variables determine popup's position in relation to the table's cell
		yOffset = -20;
		xOffset = 70;
		
	$("td.productno").hover(function(e){
		os = $(this).offset();									 
		$("img.preview", this)
			.css("top",(os.top + yOffset) + "px")
			.css("left",(os.left - $(this).width() - xOffset) + "px")
			.fadeIn("fast");						
		},
		function(){
			$("img.preview", this).fadeOut("fast");
		}
	);			
};


$(document).ready(function(){
	imagePreview();
});