function checkEnter(event) {
	event = event || window.event;
	ch = event.which || event.keyCode;
	if( ch != null &&  ch == 13 ) 
		if(  document.getElementById("input_Search").value != "" || document.getElementById("input_Search").value != "cerca") {
			document.getElementById("search_form").submit();
		}
}

function checkClear(id) {
	if(document.getElementById(id).value == 'cerca'){
		document.getElementById(id).value = '';
	}
}		

function setDefaultValue(id) {
	if(document.getElementById(id).value == ''){
		document.getElementById(id).value = 'cerca';
	}
}