var c = 1; 
var l =". $c ."; 

function showImg(t) { 
	jQuery('#image-'+ c).css('z-index','1');  
	if(t == 'prev'){ 
		c = c - 1; 
		if (c < 1){ 
			c=l; 
		} 
	} else { 
		c = c + 1; 
		if(c > l){ 
		c = 1; 
		} 
	}  
	jQuery('#image-'+ c).css('z-index','100'); 
}