function showImg(i){	
	closeIMG()
	document.getElementById('bloc_'+i).style.display="block";
}

function closeIMG(){
	tabDiv = document.getElementById('GdePict').getElementsByTagName('div');
	var n=tabDiv.length;  
	var i=0;
	for(i;i<n;i++){  
		tabDiv[i].style.display = "none";  
	} 
}