function ShowPopup()
{
	window.open("pu700.php", "nieuw", "toolbar=no, location=no, directories=no, status=no, menubar=no, scrollbars=no, resizable=no, height=320, width=250, screenX=100, screenY=100, top=400, left=600,");
	
	//popup = getCookie('popup');
//
//	if(popup == "" || popup == null)
//	{
//		if(window.open("pu700.php", "nieuw", "toolbar=no, location=no, directories=no, status=no, menubar=no, scrollbars=no, resizable=no, height=320, width=250, screenX=100, screenY=100, top=400, left=600,"))
//		{
//			popup = "true";
//			setCookie('popup',popup,1);
//		}
//	}
}

function setCookie(c_name,value,expiredays)
{
	var exdate=new Date();
	exdate.setDate(exdate.getDate()+expiredays);
	document.cookie=c_name+ "=" +escape(value)+((expiredays==null) ? "" : ";expires="+exdate.toGMTString());
}

function getCookie(c_name)
{
	if (document.cookie.length>0)
  	{
  		c_start=document.cookie.indexOf(c_name + "=");
  		if (c_start!=-1)
    	{
    		c_start=c_start + c_name.length+1;
    		c_end=document.cookie.indexOf(";",c_start);
    		if (c_end==-1) c_end=document.cookie.length;
    		return unescape(document.cookie.substring(c_start,c_end));
    	}
  	}
	
	return "";
}

function Calculate()
{
	var input_length = document.getElementById('input_length').value;
	var input_height = document.getElementById('input_height').value;
	
	var length = document.getElementById('length').value;
	var height = document.getElementById('height').value;
	var thickness = document.getElementById('thickness').value;
	
	var blocks_layer = input_length / length;
	var layers = input_height / height;
	var blocks = blocks_layer * layers;
	
	var h = height / 1000;
	var l = length / 1000;
	
	var z = l + h;
	
	var metres = z * blocks;
	
	var s_metres = 0;
	
	if(thickness == 50)
	{
		s_metres = 60;
	}
	else if(thickness == 60)
	{
		s_metres = 50;
	}
	else if(thickness == 70)
	{
		s_metres = 40;
	}
	else if(thickness == 80)
	{
		s_metres = 35;
	}
	else if(thickness == 90)
	{
		s_metres = 30;
	}
	else
	{
		s_metres = 25;
	}
	
	var temp = (metres / s_metres);
	
	if(thickness != 50 && thickness != 60 && thickness != 70 && thickness != 80 && thickness != 90)
	{
		var bussen = Math.ceil((temp * 2));
	}
	else 
	{
		var bussen = Math.ceil(temp);
	}
	
	if(!isNaN(blocks) && blocks > 0 && blocks != Infinity)
	{
		var blocks = new Number(blocks);
		document.getElementById('result1').innerHTML = parseFloat(blocks.toPrecision(6));
	}
	else
	{
		document.getElementById('result1').innerHTML = 0;
	}
	
	if(!isNaN(metres) && metres > 0 && metres != Infinity)
	{
		var metres = new Number(metres);
		document.getElementById('result2').innerHTML = parseFloat(metres.toPrecision(6));
	}
	else
	{
		document.getElementById('result2').innerHTML = 0;
	}
	
	if(!isNaN(bussen) && bussen > 0 && bussen != Infinity)
	{
		document.getElementById('result3').innerHTML = bussen;
	}
	else
	{
		document.getElementById('result3').innerHTML = 0;
	}
}