function checkEmail(email)
{	
	var valid=true;
	if ((email!="")&&(email!="undefined")&&(email!=null))
	{
		var per=email.lastIndexOf(".");		
		var at=email.indexOf("@");	
		if ((per==-1)||(at==-1)||(per-1<=at))
		{
			valid=false;
		}		
		for (var i=0; i<email.length; i++)
		{
			var srt=email.charAt(i);
			
			if ((i==0)&&((srt=="@")||(srt=="."))) 
			{
				valid=false;
			}	
			if ((srt=="'")||(srt=="\"")||(srt==" ")||(srt=="<")||(srt==">")||(srt==":")||(srt==";")||(srt=="?")||(srt==",")||(srt=="&")||(srt=="!")||(srt=="#")||(srt=="$")||(srt=="%")||(srt=="*")||(srt=="/")||(srt=="\\")||(srt=="!")||(srt=="(")||(srt==")"))
			{
				valid=false;
			}	
		}
	}	
	else
	{
		valid=false;
	}	
	return(valid);
}
function checkNum(number)
{
	var valid=true;    
	if ((number*1.0)!=number)
	{
		valid=false;
	}	
	return(valid);
}
function checkLetterNum(string)
{
	var valid=true;    
    var lower=string.toLowerCase();    
	for (var i=0; i<lower.length; i++)
	{
		var srt=lower.charAt(i);		
		if ((srt!="a")&&(srt!="b")&&(srt!="c")&&(srt!="d")&&(srt!="e")&&(srt!="f")&&(srt!="g")&&(srt!="h")&&(srt!="i")&&(srt!="j")&&(srt!="k")&&(srt!="l")&&(srt!="m")&&(srt!="n")&&(srt!="o")&&(srt!="p")&&(srt!="q")&&(srt!="r")&&(srt!="s")&&(srt!="t")&&(srt!="u")&&(srt!="v")&&(srt!="w")&&(srt!="x")&&(srt!="y")&&(srt!="z")&&(srt!="1")&&(srt!="2")&&(srt!="3")&&(srt!="4")&&(srt!="5")&&(srt!="6")&&(srt!="7")&&(srt!="8")&&(srt!="9")&&(srt!="0"))
		{
		    var valid=false;
		}
	}	
	return(valid);
}
function checkLetter(string)
{
	var valid=true;    
    var lower=string.toLowerCase();    
	for (var i=0; i<lower.length; i++)
	{
		var srt=lower.charAt(i);
		
		if ((srt!="a")&&(srt!="b")&&(srt!="c")&&(srt!="d")&&(srt!="e")&&(srt!="f")&&(srt!="g")&&(srt!="h")&&(srt!="i")&&(srt!="j")&&(srt!="k")&&(srt!="l")&&(srt!="m")&&(srt!="n")&&(srt!="o")&&(srt!="p")&&(srt!="q")&&(srt!="r")&&(srt!="s")&&(srt!="t")&&(srt!="u")&&(srt!="v")&&(srt!="w")&&(srt!="x")&&(srt!="y")&&(srt!="z"))
		{
			valid=false;
		}
	}	
	return(valid);
}
function containLetterNum(string)
{
	var valid=false;
	var letter=false;
	var num=false;    
	for (var i=0; i<string.length; i++)
	{
		var srt=string.charAt(i);		
		if ((srt=="a")||(srt=="b")||(srt=="c")||(srt=="d")||(srt=="e")||(srt=="f")||(srt=="g")&&(srt=="h")||(srt=="i")||(srt=="j")||(srt=="k")||(srt=="l")||(srt=="m")||(srt=="n")||(srt=="o")||(srt=="p")||(srt=="q")||(srt=="r")||(srt=="s")||(srt=="t")||(srt=="u")||(srt=="v")||(srt=="w")||(srt=="x")||(srt=="y")||(srt=="z"))
		{
			letter=true;
		}
		if ((srt=="1")||(srt=="2")||(srt=="3")||(srt=="4")||(srt=="5")||(srt=="6")||(srt=="7")||(srt=="8")||(srt=="9")||(srt=="0"))
		{
			num=true;
		}	
	}	
	if ((letter==true)&&(num==true))
	{
	    valid=true;
	}	
	return(valid);
}
function removeSingleQ(oldString)
{
	var	newString="";	
	for (var i=0; i<oldString.length; i++)
	{
		if (oldString.charAt(i)=="'")
		{
			newString=newString;
		}
		else 
		{	
			newString=newString+oldString.charAt(i);
		}
	}		
	return(newString);
}
function removeDoubleQ(oldString)
{
	var	newString="";	
	for (var i=0;i<oldString.length;i++)
	{
		if (oldString.charAt(i)=="\"")
		{
			newString=newString;
		}
		else 
		{	
			newString=newString+oldString.charAt(i);
		}
	}		
	return(newString);
}
function replaceSpace(oldString)
{
	var	newString="";	
	if (oldString!=null)
	{
		for (var i=0; i<oldString.length; i++)
		{
			if (oldString.charAt(i)==" ")
			{
				newString=newString+"%20";
			}
			else 
			{	
				newString=newString+oldString.charAt(i);
			}
		}		
		return(newString);
	}
	else
	{
		return("");
	}
}
function removeSpace(oldString)
{
	var	newString="";	
	if (oldString!=null)
	{
		for (var i=0; i<oldString.length; i++)
		{
			if (oldString.charAt(i)==" ")
			{
				newString=newString;
			}
			else 
			{	
				newString=newString+oldString.charAt(i);
			}
		}		
		return(newString);
	}
	else
	{
		return("");
	}
}