function validate_search_form(the_form){
	if(the_form.keywords.value==''){
		alert('Please enter your keywords');
		the_form.keywords.focus();
		return(false);
	}
	if(the_form.keywords.value.length<=3){
		alert('Please enter a bit long keyword');
		the_form.keywords.focus();
		return(false);
	}	
}

function add_item_to_cart(str_input,shop_product_id){
	var quantity_input = document.getElementById(str_input);
	var url_to_post = 'shop-cart-add.php?shop_product_id='+shop_product_id+'&quantity='+quantity_input.value;
	if(quantity_input.value==''){
		alert('Please enter a valid amount for quantity');
		return(false);
	}
	location = url_to_post;
}

function ask_yes_no($url){
	question = confirm("Are you sure you want to perform this operation?")
	if(question!="0"){
		location = $url;
		return(true);
	}
}