function val_checkbox(field,strng) {
	var err = "";
	if(field.checked == false) { err = strng +"\n"; }
	return err;
}

function val_dropdown(field,strng){
	var err = "";
	 if ( field.selectedIndex == 0 ){
			err = strng +" \n";
	}
	return err; 
}


function val_tel(field,strng){
	var err = "";
	tel1 = field.value.replace(" ","");
	var nois = 0;
	for(i = 0; i < field.value.length;i++){
		if(!isNaN(field.value.charAt(i)) && field.value.charAt(i) != " "){ nois += 1;}
	}
	if(nois < 10){ err = strng + "\n"; }
	if(nois > 15){ err = strng + "\n"; }
	var illegalChars= /[\@\<\>\,\;\:\\\"\[\]]/
	if (strng.match(illegalChars)) { error = strng + "\n"; }
	
	return err;
	
}					  

function val_textarea(field,strng,maxlen){
	var err = "";
	if(field.value == '' || field.value == ' '){
		err = strng + "\n"; }
	if(field.value.length > maxlen){ err = strng + "\n"; }
	
	return err;
}
						  
function val_textbox(field,strng){
	var err = "";
	if(field.value == '' || field.value == ' '){
		err = strng + "\n"; }
		return err;
} 

function tareaCnt(field,cntfield,maxlimit){
	if (field.value.length > maxlimit){
		field.value = field.value.substring(0, maxlimit); }
	else { cntfield.value = maxlimit - field.value.length;}
}