Hover and Exit

Unity Engine
1

Hello, I am trying to do when mouse is on guiText it changes to my color, however when I do it it always goes black and stays black when i put 255 to 0 and when I keep 255 the text goes invisible and stays invisible.
How can I fix it:

function OnMouseEnter()
{
guiText.material.color -= Color(122,76,55,255);
}

function OnMouseExit()
{
guiText.material.color -= Color(122,80,60,255);
}

Thankyou
Chris

2

Do you need to remove the minus from -= ??

function OnMouseEnter()
{
guiText.material.color -= Color(122,76,55,255);
}

function OnMouseExit()
{
guiText.material.color -= Color(122,80,60,255);
}

3

Nope taking the minus away did not work

4

Here you go.

function ColourRGB(r,g,b,a)
{

var colour = Color(r/255,g/255,b/255,a/255);

return colour;

}

function OnMouseEnter()
{

this.guiText.material.color = ColourRGB(255,0,0,255);

}

function OnMouseExit()
{

this.guiText.material.color = ColourRGB(255,0,255,255);

}