$(document).ready(function(){	
		
	$(".m").mouseenter(function (e){  	
		var c = $(this).children(":first");
		var id = c.attr("id");
		var idx = id.substr(1,1);  
				
		if (idx != m_i){
			c.attr("src", "images/but_0" + idx + "-over.gif");
		}  		  		  		  		
	});
      	  	  
	$(".m").mouseleave(function (e){
		var c = $(this).children(":first");
		var id = c.attr("id");
		var idx = id.substr(1,1);  		
		
		if (idx != m_i){
			c.attr("src", "images/but_0" + idx + ".gif");
		}  				  		
	});
});