function blendimage(divid, imageid, imagefile, millisec) {
    var speed = Math.round(millisec / 100);
    var timer = 0;
    
    //set the current image as background
    document.getElementById(divid).style.backgroundImage = "url(" + document.getElementById(imageid).src + ")";
    
    //make image transparent
    changeOpac(0, imageid);
    
    //make new image
    document.getElementById(imageid).src = imagefile;

    //fade in image
    for(i = 0; i <= 100; i++) {
        setTimeout("changeOpac(" + i + ",'" + imageid + "')",(timer * speed));
        timer++;
    }
} 

//change the opacity for different browsers
function changeOpac(opacity, id) {
    var object = document.getElementById(id).style;
    object.opacity = (opacity / 100);
    object.MozOpacity = (opacity / 100);
    object.KhtmlOpacity = (opacity / 100);
    object.filter = "alpha(opacity=" + opacity + ")";
} 

var num_photo = 1;

function demarre_accueil() { 
	num_photo++;
	setTimeout("demarre_accueil()",5000);if(num_photo==4)  num_photo=1 ; 
	blendimage('blenddiv','blendimage','photos/accueil/photo0'+num_photo+'.png',500)
	
 } 


function demarre_desert_montagne() { 
	num_photo++;
	setTimeout("demarre_desert_montagne()",5000);	if(num_photo==6)  num_photo=1 ; 
	blendimage('blenddiv','blendimage','photos/Package_Desert_montagne/photo0'+num_photo+'.png',500)
	
 } 

function demarre_mer_montagne() { 
	num_photo++;
	setTimeout("demarre_mer_montagne()",5000);	if(num_photo==5)  num_photo=1 ; 
	blendimage('blenddiv','blendimage','photos/Package_mer_montagne/photo0'+num_photo+'.png',500)
	
 } 
 
 
function calc_date_diff(){
	 	var date=0;
		var x = document.getElementById('date1_de').value;
        var y = document.getElementById('date1_a').value;
        
        //assuming that the delimiter for dt time picker is a '/'.
        var arr1 = x.split('/');
        var arr2 = y.split('/');

        var dt1 = new Date();
        dt1.setFullYear(arr1[2], arr1[1], arr1[0]);
        var dt2 = new Date();
        dt2.setFullYear(arr2[2], arr2[1], arr2[0]);
        
        date += (dt2.valueOf() - dt1.valueOf()) / (60 * 60 * 24 * 1000);
		
		//#############################################################
		
		x = document.getElementById('date2_de').value;
        y = document.getElementById('date2_a').value;
        
        //assuming that the delimiter for dt time picker is a '/'.
        arr1 = x.split('/');
        arr2 = y.split('/');

        dt1 = new Date();
        dt1.setFullYear(arr1[2], arr1[1], arr1[0]);
        dt2 = new Date();
        dt2.setFullYear(arr2[2], arr2[1], arr2[0]);
        
        date += (dt2.valueOf() - dt1.valueOf()) / (60 * 60 * 24 * 1000)
		
		//#############################################################
		
		x = document.getElementById('date3_de').value;
        y = document.getElementById('date3_a').value;
        
        //assuming that the delimiter for dt time picker is a '/'.
        arr1 = x.split('/');
        arr2 = y.split('/');

        dt1 = new Date();
        dt1.setFullYear(arr1[2], arr1[1], arr1[0]);
        dt2 = new Date();
        dt2.setFullYear(arr2[2], arr2[1], arr2[0]);
        
        date += (dt2.valueOf() - dt1.valueOf()) / (60 * 60 * 24 * 1000)

		document.getElementById('nbr_jour').value = date; 
}

function faq(num){
for(i=1;i<12;i++){
	document.getElementById('div'+i).style.display='none';
	}
document.getElementById('div'+num).style.display='';
}

function valid(){  
	if(document.getElementById('nom').value =='' ) {alert('Please fill your name'); return false;}
	if(document.getElementById('email').value =='' ) {alert('Please fill your Email'); return false;}
	if(document.getElementById('nationalite').value =='' ) {alert('Please fill your Nationality'); return false;}
	if(document.getElementById('commentaire').value =='' ) {alert('Please fill your Comment'); return false;}
	
}