function limitHeight(){
	var tab = new Array();
	tab = getElementsByClass('realisation');
	
	for(var i=0; i<tab.length; i++){
		var img = new Image();
		img.src = tab[i].src;
		var width = img.width;
		var height = img.height;
		if(height > width){
			tab[i].style.height = '149px';
		}
		else{
			tab[i].style.width = '200px';
		}
	}
	
}

addEvent(window,'load',limitHeight);