var i = 0;
		i = Math.floor(1 + Math.random() * 4);							 
		
		switch (i) {
		//image1
		    case 1:
			  homeBg="home_01_1";			   			
			  break;    
        //image2
	        case 2:
		      homeBg="home_01_2";			   			
			  break;    			   
		 //image3
		    case 3:
		      homeBg="home_01_3";			   			
			  break;    
		 //image4
		    case 4:
			  homeBg="bg_01";			   			
			  break;    
		 }