function trim(string)
{
	if(string == null)
	{
	    return "";
	}

	var index;
	var currectChar;
	//remove white spaces from string's begining.
	for (i = 0; i < string.length; i++)
	{
		currectChar = string.charAt(i);
		if(currectChar == " ")
		{
			//remove this char
			string = string.substring(i+1,string.length);
			i = i-1;
		}
		else
		{
			break;
		}
	}

	for (i = string.length - 1; i >= 0; i--)
	{
		currectChar = string.charAt(i);
		if(currectChar == " ")
		{
			//remove this char
			string = string.substring(0,i);
			i = i+1;
		}
		else
		{
			break;
		}
	}
	return string;
}