var imagenumber = 10 ; //Anzahl der Grafiken
var randomnumber = Math.random();




var rand1 = Math.round( (imagenumber-1) * randomnumber) + 1;




images = new Array
/*
images[1] = "url('/fileadmin/quantec/images/header/quantecheader1.jpg')";
images[2] = "url('/fileadmin/quantec/images/header/quantecheader2.jpg')";
images[3] = "url('/fileadmin/quantec/images/header/quantecheader3.jpg')";
images[4] = "url('/fileadmin/quantec/images/header/quantecheader4.jpg')";
images[5] = "url('/fileadmin/quantec/images/header/quantecheader5.jpg')";
images[6] = "url('/fileadmin/quantec/images/header/quantecheader6.jpg')";
images[7] = "url('/fileadmin/quantec/images/header/quantecheader7.jpg')";
images[8] = "url('/fileadmin/quantec/images/header/quantecheader8.jpg')";
images[9] = "url('/fileadmin/quantec/images/header/quantecheader9.jpg')";
images[10] = "url('/fileadmin/quantec/images/header/quantecheader10.jpg')";
*/
images[1] = "/fileadmin/quantec/images/header/quantecheader1.jpg";
images[2] = "/fileadmin/quantec/images/header/quantecheader2.jpg";
images[3] = "/fileadmin/quantec/images/header/quantecheader3.jpg";
images[4] = "/fileadmin/quantec/images/header/quantecheader4.jpg";
images[5] = "/fileadmin/quantec/images/header/quantecheader5.jpg";
images[6] = "/fileadmin/quantec/images/header/quantecheader6.jpg";
images[7] = "/fileadmin/quantec/images/header/quantecheader7.jpg";
images[8] = "/fileadmin/quantec/images/header/quantecheader8.jpg";
images[9] = "/fileadmin/quantec/images/header/quantecheader9.jpg";
images[10] = "/fileadmin/quantec/images/header/quantecheader10.jpg";



var image = images[rand1] 

//document.getElementById("main_menu_container").style.backgroundImage = image;