function checkEmail(email)
{    
    var emailReg = "^[a-zA-Z0-9_\+-]+(\\.[a-zA-Z0-9_\+-]+)*@[a-zA-Z0-9-]+(\\.[a-zA-Z0-9-]+)*\\.([a-zA-Z]{2,4})$";    
    var regex = new RegExp(emailReg);
	return(regex.test(email));
}
function checkPassword(password)
{	
	var val = false;
	if ( (password.length >= 5) && (password.length <= 15) && (password.match(/[a-z]/i)) && (password.match(/[0-9]/g)) )
	{
		val = true;		
	}		
	return(val);
}
function checkURL(url)
{
    //var urlReg = /https?:\/\/([-\w\.]+)+(:\d+)?(\/([\w/_\.]*(\?\S+)?)?)?/;    
    var urlReg = /\.(aero|arpa|biz|com|coop|edu|gov|info|int|mil|museum|name|net|org|pro|travel|mobi|[a-z][a-z])($|\/|\?)/; 

    var regex = new RegExp(urlReg);
	return(regex.test(url));

}
function checkNum(number)
{
	var val = true;    
	if ((number*1.0)!=number)
	{
		val = false;
	}	
	return(val);
}
function checkLetterNum(str)
{
	var val = true;
	if (str.match(/[\W_]/))
	{
		val = false;
	}		
	return(val);
}
function checkLetter(str)
{
	var val = true;
	if (str.match(/[\W_0-9]/))
	{
		val = false;
	}		
	return(val);
}
function containLetterNum(str)
{
	return(str.match(/\w/));
}
function checkDate(str) //MM/DD/YYY
{
    var val = true;
    if (str != "")
    {
        var tdt = new Date(str);
        val = (!isNaN (tdt.getFullYear() ) ) ;
        
        var adt = str.split("/");        
        if ( adt[1] != tdt.getDate() )
        {
            val = false;
        }
    }    
    return(val);
}
function removeSingleQ(oldstr)
{
	var	newstr="";	
	for (var i=0; i<oldstr.length; i++)
	{
		if (oldstr.charAt(i)=="'")
		{
			newstr=newstr;
		}
		else 
		{	
			newstr=newstr+oldstr.charAt(i);
		}
	}		
	return(newstr);
}
function removeDoubleQ(oldstr)
{
	var	newstr="";	
	for (var i=0;i<oldstr.length;i++)
	{
		if (oldstr.charAt(i)=="\"")
		{
			newstr=newstr;
		}
		else 
		{	
			newstr=newstr+oldstr.charAt(i);
		}
	}		
	return(newstr);
}
function replaceSpace(oldstr)
{
	var	newstr="";	
	if (oldstr!=null)
	{
		for (var i=0; i<oldstr.length; i++)
		{
			if (oldstr.charAt(i)==" ")
			{
				newstr=newstr+"%20";
			}
			else 
			{	
				newstr=newstr+oldstr.charAt(i);
			}
		}		
		return(newstr);
	}
	else
	{
		return("");
	}
}
function removeSpace(oldstr)
{
	var	newstr="";	
	if (oldstr!=null)
	{
		for (var i=0; i<oldstr.length; i++)
		{
			if (oldstr.charAt(i)==" ")
			{
				newstr=newstr;
			}
			else 
			{	
				newstr=newstr+oldstr.charAt(i);
			}
		}		
		return(newstr);
	}
	else
	{
		return("");
	}
}