function comprovaBuit(elem){
	if (elem.value == ""){
		elem.className = 'input_usuaris_error';
	}	
}
function comprovaLlarg(elem, long){
	if (elem.value.length < long){
		elem.className = 'input_usuaris_error';
	}	
}
function entrada(elem){
	elem.className = 'input_usuaris';
}

//txt posar nom_form.nom_input
function comprovaPass(elem,txt){
	 element = eval("document."+txt);
	if (elem.value == "" || element.value != elem.value){
		elem.className = 'input_usuaris_error';
		element.className = 'input_usuaris_error';
	}else{
		elem.className = 'input_usuaris';
		element.className = 'input_usuaris';
	}
		
}
function comprovaEmail(elem){
	var filter  = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
	if (elem.value == "" || !filter.test(elem.value)){
		elem.className = 'input_usuaris_error';
	}	
}
function comprovaSelects(elem){
	if (elem.selectedIndex == 0){
		elem.className = 'input_usuaris_error';
	}	
}

function numeric() {
  var key=window.event.keyCode;//codigo de tecla.
  if ((key<48 || key>57)) window.event.keyCode=0; //&& key!=44 && key!=46
  //if (key==46) window.event.keyCode=44;
}