function emailCheck (emailStr) {
	var emailPat=/^(.+)@(.+)$/
	var specialChars="\\(\\)<>@,;:\\\\\\\"\\.\\[\\]"
	var validChars="\[^\\s" + specialChars + "\]"
	var quotedUser="(\"[^\"]*\")"
	var ipDomainPat=/^\[(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})\]$/
	var atom=validChars + '+'
	var word="(" + atom + "|" + quotedUser + ")"
	var userPat=new RegExp("^" + word + "(\\." + word + ")*$")
	var domainPat=new RegExp("^" + atom + "(\\." + atom +")*$")
	
	
	var matchArray=emailStr.match(emailPat)
	if (matchArray==null) {
		return false
	}
	var user=matchArray[1]
	var domain=matchArray[2]
	
	if (user.match(userPat)==null) {
		return false
	}
	
	var IPArray=domain.match(ipDomainPat)
	if (IPArray!=null) {
		  for (var i=1;i<=4;i++) {
			if (IPArray[i]>255) {
			return false
			}
		}
		return true
	}
	
	var domainArray=domain.match(domainPat)
	if (domainArray==null) {
		return false
	}
	
	var atomPat=new RegExp(atom,"g")
	var domArr=domain.match(atomPat)
	var len=domArr.length
	if (domArr[domArr.length-1].length<2 || 
		domArr[domArr.length-1].length>3) {
	   return false
	}
	
	if (len<2) {
	   var errStr="This address is missing a hostname!"
	   return false
	}
	
	return true;
}

function trim(stringToTrim) {
	return stringToTrim.replace(/^\s+|\s+$/g,"");
}
function ltrim(stringToTrim) {
	return stringToTrim.replace(/^\s+/,"");
}
function rtrim(stringToTrim) {
	return stringToTrim.replace(/\s+$/,"");
}

function toggle_layer(layer_id) {
	layer = document.getElementById(layer_id);
	
	if(layer) {
		if(layer.style.display == 'none') {
			layer.style.display = 'block';
		} else {
			layer.style.display = 'none';
		}
	}
}

function hide_layer (layer_id) {
	layer = document.getElementById(layer_id);
	if(layer) {
		if(layer.style.display != 'none') {
			layer.style.display = 'none';
		}
	}
}

function effect_input (form_id, classOnFocus) {
	var form = document.getElementById(form_id);
	if(form) {
		var inputs = form.getElementsByTagName('input');
		for(var i=0;i<inputs.length;i++) {
			if(inputs[i].type == 'text') {
				
				inputs[i].onfocus = function (event) { 
					if(trim(this.value) == trim(this.defaultValue)) {						
						this.value = '';
						this.className += ' '+classOnFocus;
					}
				};
				
				inputs[i].onblur = function (event) { 
					if(trim(this.value) == trim(this.defaultValue)) {					
						eval('this.className = this.className.replace(/ '+classOnFocus+'/g,"");');
					} else if(trim(this.value) == '') {
						this.value = this.defaultValue;		
						eval('this.className = this.className.replace(/ '+classOnFocus+'/g,"");');
					}
				};
				//alert(inputs[i].onfocus);
				//alert(inputs[i].value);
			}
		}
	}
}

function combineFunc(function1, function2) {
	return function() {
		if (function1)
			function1();
		if (function2)
			function2();
	}
}