function init() {

var startSurveyForm = document.getElementById("form1");

var randomNumber=Math.floor(Math.random()*4)

if (randomNumber == 0) {
	startSurveyForm.style.background = "url(Css/CSSPublik/Images/Index/start-survey-bg.jpg) no-repeat top right";
}

else if (randomNumber == 1) {
	startSurveyForm.style.background = "url(Css/CSSPublik/Images/Index/start-survey-bg2.jpg) no-repeat top right";
}

else if (randomNumber == 2) {
	startSurveyForm.style.background = "url(Css/CSSPublik/Images/Index/start-survey-bg3.jpg) no-repeat top right";
}

else if (randomNumber == 3) {
	startSurveyForm.style.background = "url(Css/CSSPublik/Images/Index/start-survey-bg4.jpg) no-repeat top right";
}


}

window.onload = init;