function prepare() {
	if(!document.getElementById) return false; 
	var keresoMezo = document.getElementById("keres");
	var defaultValue = keresoMezo.value;
	keresoMezo.onfocus = function() {
		if(keresoMezo.value == defaultValue) {
			keresoMezo.value = "";
		}
	}
	keresoMezo.onblur = function() {
		if(keresoMezo.value == "") {
			keresoMezo.value = defaultValue;
		}
	}
}