function text_limit(limit, field, span_field){
	if (document.getElementById(field).value.length > limit){
		document.getElementById(field).value = document.getElementById(field).value.substring(0, limit);
	}
	if(span_field.length > 0){
		txt = "";
		left_chars = limit - document.getElementById(field).value.length;
		txt = "Left " + left_chars + " chars of " + limit + "";
		document.getElementById(span_field).innerHTML = txt;
	}
}

function check_email(email){
	Wzor = /^[0-9a-zA-Z.-_\-]+\@[0-9a-zA-Z.-_\-]+\.[0-9a-zA-Z.]{2,4}$/;
	if (Wzor.test(email) == false){
		return false;	
	} else {
		return true;
	}
}


function _change_password(){
	if (document.getElementById("password").disabled){
		document.getElementById("password").disabled = false;
		document.getElementById("password2").disabled = false;
	} else {
		document.getElementById("password").disabled = true;
		document.getElementById("password2").disabled = true;
	}
}

function animate_cs_banners(){
	//hide
	obj = $('case_study_'+current_cs_number+'');
	if (obj) {
		var temp = obj.innerHTML;
		obj.remove('case_study_'+current_cs_number+'');
		new Insertion.Bottom('case_studies', '<span id="case_study_'+current_cs_number+'">'+temp+'</span>');
	} else{
		//
	}
	//show
	current_end_cs_number ++;
	current_cs_number ++;
	if (current_end_cs_number > max_cs_number) current_end_cs_number = 1;
	if (current_cs_number > max_cs_number) current_cs_number = 0;
	
}