// JavaScript Document
function big(id,start,img_src)
{
	var src_string="small_img";
	var name;
	for(var i=start; i<start + 4; i++)
	{
		name = src_string+i;
		
		if(name==id)
		{
			document.getElementById(name).style.border='3px solid #29a0d7';
			document.getElementById('big_img').src= document.getElementById(name).src;
		}
		else
		{
			document.getElementById(name).style.border='none';
		}
	}

	 	//dimension();
	
}
function dimension()
{
	

	var dim=300;
	//alert(document.getElementById('big_img').offsetHeight);
	//alert(document.getElementById('big_img').offsetWidth);

	if(document.getElementById('big_img').offsetHeight > document.getElementById('big_img').offsetWidth)
	{
		var rapporto = (dim*100/document.getElementById('big_img').offsetHeight);
		var x = document.getElementById('big_img').offsetWidth*((rapporto)/100);
		var y = document.getElementById('big_img').offsetHeight*((rapporto)/100);
		alert("w "+x+" h "+y);
	
		document.getElementById('big_img').style.width = x+"px";
		document.getElementById('big_img').style.height= y+"px";
		//alert('vert');
	}
		
	//alert('altezza' + img_prod.offsetHeight);
	
	
}