/*
	javascript development
	============================
	website 	: 	santor
	date 		: 	8-6-2012		
	author 		: 	mayra metaxa / lab21.gr

*/

function click_clear(thisfield) 
{
	if (thisfield.value == thisfield.defaultValue)
		thisfield.value = "";
	else if (thisfield.value == "")
		thisfield.value = thisfield.defaultValue;
}

function show_error(id)
{
	$('#'+id).css("background", "#F2EADA");
}

function clear_errors(formid, color)
{
	var form = document.getElementById(formid);
	for (i=0;i<form.elements.length;i++)
	{
		if ( (form.elements[i].type != "button") && (form.elements[i].type != "reset") )
			form.elements[i].style.background="#"+color;
	}
}

function checkEmail(elem)
{
   var field = document.getElementById(elem);
   var emailExp = /^[\w\-\.\+]+\@[a-zA-Z0-9\.\-]+\.[a-zA-Z0-9]{2,4}$/;
   if (field.value.length ==0)
		return false;

   if(field.value.match(emailExp))
		return true;
   else 
		return false;   
}

function check_form(formid, mandatory_fields, numericfields, emailid, color)
{
	color = typeof(color) != "undefined" ? color : 'ffffff';
	
	clear_errors(formid, color);

	var man = mandatory_fields.split(",");
	for (i=0;i<man.length;i++)
	{
		if ($('#'+man[i]).val()=="")		
		{
			show_error(man[i]);
			alert ("You must fill all the mandatory fields (*)");
			return false;
		}
	}		

	if (emailid!="")
	{
		if (!checkEmail(emailid))
		{
			show_error(emailid);
			alert ("Your email address is not valid.");
			return false;
		}
	}
	
	if (numericfields != "")
	{
		var numeric = numericfields.split(",");
		for (i=0;i<numeric.length;i++)
		{
			var nv = $('#'+numeric[i]).val().replace(/,/,".");
			$('#'+numeric[i]).val(nv);
			
			if (isNaN ($('#'+numeric[i]).val()))
			{
				show_error(numeric[i]);
				alert (numeric[i]+": should be a number. Plase check and try again!");
				return false;
			}
		}
	}

	document.getElementById(formid).submit();
}


function resize_gal()
{
	var img_w = 1450;
	var img_h = 950;
	
	var ratio_h = img_h/img_w;
	var ratio_w = img_w/img_h;
	
	var w = $(window).width();
	var h = $(window).height();
	
	if (h>1000)
		$(".footer_line").css({top: "80%", marginTop: "0px"});
	
	if ((h/w)<ratio_h)
	{
		$('.slide_div, .slide_div img').width(w);
		$('.slide_div, .slide_div img').height(ratio_h*w);
		var nw = w;
		var nh = ratio_h*w;
	}
	else
	{
		$('.slide_div, .slide_div img').height(h);
		$('.slide_div, .slide_div img').width(ratio_w*h);
		var nw = ratio_w*h;
		var nh = h;
	}

	var margintop = Math.abs(nh/2);
	var marginleft = Math.abs(nw/2);
	$('.slide_div img').css({top:"50%", left: "50%", marginTop: "-"+margintop+"px", marginLeft: "-"+marginleft+"px"});				
}